String-Funktionen

Siehe auch

Schauen Sie sich die Perl-kompatiblen Funktionen für reguläre Ausdrücke an, wenn Sie noch mächtigere Funktionen zur String-Verarbeitung nutzen möchten. Zur Arbeit mit Multibyte-Zeichenkodierungen stehen die Multibyte String Funktionen zur Verfügung.

Inhaltsverzeichnis

addcslashes — Stellt bestimmten Zeichen eines Strings ein "\" voran (wie in C)
addslashes — Stellt bestimmten Zeichen eines Strings ein "\" voran
bin2hex — Wandelt Binär-Daten in ihre hexadezimale Entsprechung um
chop — Alias von rtrim
chr — Erzeugt eine Ein-Byte-Zeichenkette aus einer Zahl
chunk_split — Zerlegt einen String in Teile gleicher Länge
convert_cyr_string — Konvertiert Strings von einem kyrillischen Zeichensatz in einen anderen
convert_uudecode — Dekodiert eine UU-kodierte Zeichenkette
convert_uuencode — UU-kodiert eine Zeichenkette
count_chars — Gibt Informationen über die in einem String enthaltenen Zeichen zurück
crc32 — Berechnet den polynomischen CRC32-Wert eines Strings
crypt — Einweg-String-Hashing
echo — Gibt einen oder mehrere Strings aus
explode — Teilt eine Zeichenkette anhand einer Zeichenkette
fprintf — Schreibt einen formatierten String in einen Stream
get_html_translation_table — Liefert die Umwandlungstabelle, die von htmlspecialchars und htmlentities verwendet wird
hebrev — Konvertiert logischen hebräischen Text in sichtbaren Text
hebrevc — Konvertiert (natürlichen) hebräischen Text in sichtbaren Text inkl. Anpassung von Zeilenumbrüchen
hex2bin — Dekodiert einen hexadezimal kodierten Binärstring
html_entity_decode — Wandelt HTML-Entities in ihre entsprechenden Zeichen um
htmlentities — Wandelt alle geeigneten Zeichen in entsprechende HTML-Entities um
htmlspecialchars_decode — Wandelt besondere HTML-Entities zurück in Zeichen um
htmlspecialchars — Wandelt Sonderzeichen in HTML-Entities um
implode — Verbindet Array-Elemente zu einem String
join — Alias von implode
lcfirst — Wandelt den ersten Buchstaben eines Strings in einen Kleinbuchstaben um
levenshtein — Berechnet die Levenshtein-Distanz zwischen zwei Strings
localeconv — Ermittelt die Formatierungsinformationen für Zahlen
ltrim — Entfernt Leerraum (oder andere Zeichen) vom Anfang eines Strings
md5_file — Berechnet den MD5-Code einer Datei
md5 — Errechnet den MD5-Hash eines Strings
metaphone — Berechnet den Metaphone-Schlüssel eines Strings
money_format — Formatiert eine Zahl als Währungs-Zeichenkette
nl_langinfo — Query-Language und Locale-Information
nl2br — Fügt vor allen Zeilenumbrüchen eines Strings HTML-Zeilenumbrüche ein
number_format — Formatiert eine Zahl mit Tausender-Trennzeichen
ord — Konvertiert das erste Byte einer Zeichenkette in einen Wert zwischen 0 und 255
parse_str — Überträgt einen String in Variablen
print — Ausgabe eines Strings
printf — Liefert einen formatierten String
quoted_printable_decode — Konvertiert einen "Quoted-Printable"-String in einen 8-Bit-String
quoted_printable_encode — Wandelt einen 8-Bit-String in sein 'Quoted Printable' Gegenstück
quotemeta — Maskiert (quotet) Meta-Zeichen
rtrim — Entfernt Leerraum (oder andere Zeichen) vom Ende eines Strings
setlocale — Legt regionale (locale) Einstellungen fest
sha1_file — Berechnet den SHA1-Hash einer Datei
sha1 — Berechnet den SHA1-Hash eines Strings
similar_text — Berechnet die Ähnlichkeit zweier Zeichenketten
soundex — Berechnet die Laut-Ähnlichkeit eines Strings
sprintf — Gibt einen formatierten String zurück
sscanf — Überträgt einen String in ein angegebenes Format
str_contains — Determine if a string contains a given substring
str_decrement — Decrement an alphanumeric string
str_ends_with — Checks if a string ends with a given substring
str_getcsv — Parst einen CSV-String in ein Array
str_increment — Increment an alphanumeric string
str_ireplace — Groß- und kleinschreibungsunabhängige Version von str_replace
str_pad — Erweitert einen String unter Verwendung eines anderen Strings auf eine bestimmte Länge
str_repeat — Wiederholt einen String
str_replace — Ersetzt alle Vorkommen des Suchstrings durch einen anderen String
str_rot13 — Führt die ROT13-Transformation auf einen String aus
str_shuffle — Mischt einen String nach dem Zufallsprinzip
str_split — Konvertiert einen String in ein Array
str_starts_with — Checks if a string starts with a given substring
str_word_count — Liefert Informationen über in einem String verwendete Worte
strcasecmp — Vergleich von Zeichenketten ohne Unterscheidung der Groß- und Kleinschreibung (binärsicher)
strchr — Alias von strstr
strcmp — Vergleich zweier Strings (binärsicher)
strcoll — Locale-basierter Zeichenkettenvergleich
strcspn — Ermittelt die Anzahl der nicht übereinstimmenden Zeichen
strip_tags — Entfernt HTML- und PHP-Tags aus einem String
stripcslashes — Demaskiert einen mit addcslashes maskierten String
stripos — Findet das erste Vorkommen eines Teilstrings in einem String, unabhängig von Groß- und Kleinschreibung
stripslashes — Entfernt Maskierungszeichen aus einem String
stristr — Wie strstr, aber unabhängig von Groß- bzw. Kleinschreibung
strlen — Ermitteln der String-Länge
strnatcasecmp — String-Vergleich "natürlicher Ordnung" ohne Berücksichtigung der Groß- und Kleinschreibung
strnatcmp — String-Vergleich unter Verwendung einer "natürlichen Ordnung"
strncasecmp — Binärsicherer Vergleich von Zeichenketten der ersten n Zeichen ohne Berücksichtigung der Groß- und Kleinschreibung
strncmp — String-Vergleich der ersten n Zeichen (binärsicher)
strpbrk — Durchsucht einen String nach einem Zeichen aus einer Gruppe von Zeichen
strpos — Sucht die Position des ersten Vorkommens des Suchstrings in einem String
strrchr — Sucht das letzte Vorkommen eines Zeichens in einem String
strrev — Kehrt einen String um
strripos — Findet das letzte Vorkommen der gesuchten Zeichenkette in einem String, unabhängig von Groß- und Kleinschreibung
strrpos — Findet die Position des letzten Vorkommens eines Teilstrings innerhalb einer Zeichenkette
strspn — Ermittelt die Länge des initialen Abschnitts einer Zeichenkette, der ausschließlich aus Zeichen besteht, die in einer übergebenen Maske enthalten sind
strstr — Findet das erste Vorkommen eines Strings
strtok — Zerlegt einen String
strtolower — Setzt einen String in Kleinbuchstaben um
strtoupper — Wandelt alle Zeichen eines Strings in Großbuchstaben um
strtr — Tauscht Zeichen aus oder ersetzt Zeichenketten
substr_compare — Binärsicherer Vergleich zweier Strings, beginnend an einer bestimmten Position und endend nach einer festgelegten Länge
substr_count — Ermittelt, wie oft eine Zeichenkette in einem String vorkommt
substr_replace — Ersetzt Text innerhalb einer Zeichenkette
substr — Liefert einen Teil eines Strings
trim — Entfernt Whitespaces (oder andere Zeichen) am Anfang und Ende eines Strings
ucfirst — Verwandelt das erste Zeichen eines Strings in einen Großbuchstaben
ucwords — Wandelt jeden ersten Buchstaben eines Wortes innerhalb eines Strings in einen Großbuchstaben um
utf8_decode — Konvertiert eine Zeichenkette von UTF-8 nach ISO-8859-1 und ersetzt ungültige und nicht darstellbare Zeichen
utf8_encode — Konvertiert eine Zeichenkette von ISO-8859-1 nach UTF-8
vfprintf — Schreibt einen formatierten String in einen Stream
vprintf — Gibt einen formatierten String aus
vsprintf — Gibt einen formatierten String zurück
wordwrap — Umbricht einen String nach einer bestimmten Anzahl Zeichen

add a note

User Contributed Notes 24 notes

down

lrirwin at alum dot wustl dot edu ¶

3 years ago


I'm converting 30 year old code and needed a string TAB function:

  //tab function similar to TAB used in old BASIC languages
  //though some of them did not truncate if the string were
  //longer than the requested position
  function tab($instring="",$topos=0){
    if(strlen($instring)<$topos){
      $result=str_pad($instring,$topos-1," ",STR_PAD_RIGHT);
    }else{
      $result=substr($instring,0,$topos-1);
    }
    return $result;
  }

  $pline="String with this tab to 50 and";
  $tline=tab($pline,50)."finish it.";
  echo $tline.PHP_EOL;
  $pline="101010101020202020203030303030404040404050505050506060606060";
  $tline=tab($pline,50)."finish it.";
  echo $tline.PHP_EOL;

  //Results in this output:
  //String with this tab to 50 and                   finish it.
  //1010101010202020202030303030304040404040505050505finish it.

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-7

t0russ at gmail dot com ¶

19 years ago


to kristin at greenaple dot on dot ca:
thanx for sharing.
your function in recursive form proved to be slightly faster and it returns false (as it should) when the character is not found instead of number 0:
<?php
function strnposr($haystack, $needle, $occurance, $pos = 0) {
    return ($occurance<2)?strpos($haystack, $needle, $pos):strnposr($haystack,$needle,$occurance-1,strpos($haystack, $needle, $pos) + 1);
}
?>

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-6

kristin at greenapple dot on dot ca ¶

19 years ago


I really searched for a function that would do this as I've seen it in other languages but I couldn't find it here. This is particularily useful when combined with substr() to take the first part of a string up to a certain point.

strnpos() - Find the nth position of needle in haystack.

<?php

    function strnpos($haystack, $needle, $occurance, $pos = 0) {
        
        for ($i = 1; $i <= $occurance; $i++) {
            $pos = strpos($haystack, $needle, $pos) + 1;
        }
        return $pos - 1;
        
    }

?>

Example: Give me everything up to the fourth occurance of '/'.

<?php

    $haystack = "/home/username/www/index.php";
    $needle = "/";
    
    $root_dir = substr($haystack, 0, strnpos($haystack, $needle, 4));
    
    echo $root_dir;
    
?>

Returns: /home/username/www

Use this example with the server variable $_SERVER['SCRIPT_NAME'] as the haystack and you can self-discover a document's root directory for the purposes of locating global files automatically!

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-9

admin at fivestarbuy dot com ¶

19 years ago


This example lets you parse an unparsed strings variables. Warning: This could cause security leaks if you allow users to pass $variables through this engine. I recommend only using this for your Content Management System.

<?
$mytime=time();
$mydog="My Dog Ate My PHP!";

# Your Parsing String:
$s1 = 'Hyphen Variable Preserving: $mytime, and $mydog';
echo "Before: <br><br>$s1<br><br>";

# Remember, wherever you define this, it will not be defined GLOBAL into the function
# which is why we define it here. Defining it global could lead to security issues.
$vardata=get_defined_vars();

# Parse the string
$s1 = StrParse($s1,$vardata);

echo "After: <br><br>$s1";

function StrParse($str,$vardata) {
# Takes a string, or piece of data, that contains PHP Variables
 
 # For example, unparsed variables like:  Test using time: $mytime
 # This example shows $mytime, and not the actual variable value.
 # The end result shows the actual variable value of $mytime.

 # This is useful for building a content management system,
 # and directing your variables into your content data,
 # where content is stored in a file or database, unparsed.
 # Of course this could slow down page loads, but it's a good way
 # to parse data from current variables into your loaded new data
 # making it compatible.
 
# Then the variables are replaced with the actual variable..
$getvarkeys=array_keys($vardata);
$ret=$str;
for ($x=0; $x < count($getvarkeys); $x++) {
    $myvar=$getvarkeys[$x];
    #echo "Variable: " . $myvar . " [" . $vardata[$myvar] . "]<br>";
    $ret=str_replace('$' . $myvar, $vardata[$myvar], $ret);
}
return $ret;

}

?>

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-8

[tab!] ¶

20 years ago


//
// string strtrmvistl(  string str, [int maxlen = 64], 
//                      [bool right_justify = false],
//                      [string delimter = "<br>\n"])
// 
// splits a long string into two chunks (a start and an end chunk) 
// of a given maximum length and seperates them by a given delimeter. 
// a second chunk can be right-justified within maxlen.
// may be used to 'spread' a string over two lines.
//

function strtrmvistl($str, $maxlen = 64, $right_justify = false, $delimter = "<br>\n") {
    if(($len = strlen($str = chop($str))) > ($maxlen = max($maxlen, 12))) {
        $newstr = substr($str, 0, $maxlen - 3);

        if($len > ($maxlen - 3)) {
            $endlen = min(($len - strlen($newstr)), $maxlen - 3);
            $newstr .= "..." . $delimter;

            if($right_justify)
                $newstr .= str_pad('', $maxlen - $endlen - 3, ' ');

            $newstr .= "..." . substr($str, $len - $endlen);
        }

        return($newstr);
    }

    return($str);
}

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-8

webmaster at cafe-clope dot net ¶

19 years ago


A comprehensive concatenation function, that works with array and strings

<?php
function str_cat() {
  $args = func_get_args() ;
    
  // Asserts that every array given as argument is $dim-size.
  // Keys in arrays are stripped off.
  // If no array is found, $dim stays unset.
  foreach($args as $key => $arg) {
    if(is_array($arg)) {
      if(!isset($dim))
        $dim = count($arg) ;
      elseif($dim != count($arg))
        return FALSE ;
      $args[$key] = array_values($arg) ;
    }
  }
        
  // Concatenation
  if(isset($dim)) {
    $result = array() ;
    for($i=0;$i<$dim;$i++) {
      $result[$i] = '' ;
      foreach($args as $arg)
        $result[$i] .= ( is_array($arg) ? $arg[$i] : $arg ) ;
    }
    return $result ;
  } else {
    return implode($args) ;
  }
}
?>

A simple example :

<?php
str_cat(array(1,2,3), '-', array('foo' => 'foo', 'bar' => 'bar', 'noop' => 'noop')) ;
?>

will return :
Array (
  [0] => 1-foo
  [1] => 2-bar
  [2] => 3-noop
)

More usefull :

<?php
$myget = $_GET ; // retrieving previous $_GET values
$myget['foo'] = 'b a r' ; // changing one value
$myget = str_cat(array_keys($myget), '=', array_map('rawurlencode', array_values($myget))) ;
$querystring = implode(ini_get('arg_separator.output'), $myget)) ;
?>

will return a valid querystring with some values changed.

Note that <?php str_cat('foo', '&', 'bar') ; ?> will return 'foo&bar', while <?php str_cat(array('foo'), '&', 'bar') ; ?> will return array(0 => foo&bar)

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-9

terry dot greenlaw at logicalshift dot com ¶

20 years ago


Here's a simpler "simplest" way to toggle through a set of 1..n colors for web backgrounds:



<?php

$colours = array('#000000', '#808080', '#A0A0A0', '#FFFFFF');



// Get a colour

$color = next($colors) or $color = reset($colors);

?>



The code doesn't need to know anything about the number of elements being cycled through. That way you won't have to tracking down all the code when changing the number of colors or the color values.

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-10

Anonymous ¶

19 years ago


In response to hackajar <matt> yahoo <trot> com,

No string-to-array function exists because it is not needed. If you reference a string with an offset like you do with an array, the character at that offset will be return. This is documented in section III.11's "Strings" article under the "String access and modification by character" heading.

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-10

str at maphpia dot com ¶

11 years ago


I was looking for a function to find the common substring in 2 different strings. I tried both the mb_string_intersect and string_intersect functions listed here but didn't work for me. I found the algorithm at http://en.wikibooks.org/wiki/Algorithm_implementation/Strings/Longest_common_substring#PHP so here I post you the function

<?php

/**
 * Finds the matching string between 2 strings
 *
 * @param string $string1
 * @param string $string2
 * @param number $minChars
 *
 * @return NULL|string
 *
 * @link http://en.wikibooks.org/wiki/Algorithm_implementation/Strings/Longest_common_substring#PHP
 */
function string_intersect($string_1, $string_2)
{
    $string_1_length = strlen($string_1);
    $string_2_length = strlen($string_2);
    $return          = "";

    if ($string_1_length === 0 || $string_2_length === 0) {
        // No similarities
        return $return;
    }

    $longest_common_subsequence = array();

    // Initialize the CSL array to assume there are no similarities
    for ($i = 0; $i < $string_1_length; $i++) {
        $longest_common_subsequence[$i] = array();
        for ($j = 0; $j < $string_2_length; $j++) {
            $longest_common_subsequence[$i][$j] = 0;
        }
    }

    $largest_size = 0;

    for ($i = 0; $i < $string_1_length; $i++) {
        for ($j = 0; $j < $string_2_length; $j++) {
            // Check every combination of characters
            if ($string_1[$i] === $string_2[$j]) {
                // These are the same in both strings
                if ($i === 0 || $j === 0) {
                    // It's the first character, so it's clearly only 1 character long
                    $longest_common_subsequence[$i][$j] = 1;
                } else {
                    // It's one character longer than the string from the previous character
                    $longest_common_subsequence[$i][$j] = $longest_common_subsequence[$i - 1][$j - 1] + 1;
                }

                if ($longest_common_subsequence[$i][$j] > $largest_size) {
                    // Remember this as the largest
                    $largest_size = $longest_common_subsequence[$i][$j];
                    // Wipe any previous results
                    $return       = "";
                    // And then fall through to remember this new value
                }

                if ($longest_common_subsequence[$i][$j] === $largest_size) {
                    // Remember the largest string(s)
                    $return = substr($string_1, $i - $largest_size + 1, $largest_size);
                }
            }
            // Else, $CSL should be set to 0, which it was already initialized to
        }
    }

    // Return the list of matches
    return $return;
}

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-9

admin at rotarymulundeast dot org ¶

18 years ago


Here's an easier way to find nth...

function nth($numbex){
  if ($numbex%10 == 1 && $numbex%100 != 11) $sth='st';
  elseif ($numbex%10 == 2 && $numbex%100 != 12) $sth='nd';
  elseif ($numbex%10 == 3 && $numbex%100 != 13) $sth='rd';
  else $sth = 'th';
  return $sth;
}

there is is no need to check if the user has entered a non-integer as we may be using this function for expressing variables as well eg. ith value of x , nth root of z ,etc...

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-10

james dot d dot baker at gmail dot com ¶

19 years ago


<?php
/*
Written By James Baker, May 27th 2005

sentenceCase($string);
    $string: The string to convert to sentence case.

Converts a string into proper sentence case (First letter of each sentance capital, all the others smaller)

Example Usage:
echo sentenceCase("HELLO WORLD!!! THIS IS A CAPITALISED SENTENCE. this isn't.");

Returns:
Hello world!!! This is a capitalised sentence. This isn't.
*/

function sentenceCase($s){
    $str = strtolower($s);
    $cap = true;
    
    for($x = 0; $x < strlen($str); $x++){
        $letter = substr($str, $x, 1);
        if($letter == "." || $letter == "!" || $letter == "?"){
            $cap = true;
        }elseif($letter != " " && $cap == true){
            $letter = strtoupper($letter);
            $cap = false;
        }
        
        $ret .= $letter;
    }
    
    return $ret;
}
?>

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-9

navarr at gmail dot com ¶

18 years ago


stripos for PHP4.x

<?php
  function stripos($haystack,$needle) {
    return strpos(strtoupper($haystack),strtoupper($needle));
  }
?>

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-11

SteveRusin ¶

18 years ago


The functions below:

function beginsWith( $str, $sub ) 
function endsWith( $str, $sub ) 

Are correct, but flawed.  You'd need to use the === operator instead:

function beginsWith( $str, $sub ) {
   return ( substr( $str, 0, strlen( $sub ) ) === $sub );
}
function endsWith( $str, $sub ) {
   return ( substr( $str, strlen( $str ) - strlen( $sub ) ) === $sub );
}

Otherwise, endsWith would return "foobar.0" ends with ".0" as well as "0" or "00" or any amount of zeros because numerically .0 does equal 0.

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-11

Anonymous ¶

19 years ago


to: james dot d dot baker at gmail dot com

PHP has a builtin function  for doing what your function does,

http://php.net/ucfirst
http://php.net/ucwords

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-13

Verdauga ¶

16 years ago


Just a note in regards to bloopletech a few posts down:

The word "and" should not be used when converting numbers to text.  "And" (at least in US English) should only be used to indicate the decimal place.

Example:
1,796,706 => one million, seven hundred ninety-six thousand, seven hundred six.
594,359.34 => five hundred ninety four thousand, three hundred fifty nine and thirty four hundredths

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-13

andy a t onesandzeros d o t biz ¶

19 years ago


I use these little doo-dads quite a bit. I just thought I'd share them and maybe save someone a little time. No biggy. :)

// returns true if $str begins with $sub
function beginsWith( $str, $sub ) {
    return ( substr( $str, 0, strlen( $sub ) ) == $sub );
}

// return tru if $str ends with $sub
function endsWith( $str, $sub ) {
    return ( substr( $str, strlen( $str ) - strlen( $sub ) ) == $sub );
}

// trims off x chars from the front of a string
// or the matching string in $off is trimmed off
function trimOffFront( $off, $str ) {
    if( is_numeric( $off ) )
        return substr( $str, $off );
    else
        return substr( $str, strlen( $off ) );
}

// trims off x chars from the end of a string
// or the matching string in $off is trimmed off
function trimOffEnd( $off, $str ) {
    if( is_numeric( $off ) )
        return substr( $str, 0, strlen( $str ) - $off );
    else
        return substr( $str, 0, strlen( $str ) - strlen( $off ) );
}

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-11

mike "eyes" moe ¶

17 years ago


Here is a truly random string generator it uses the most common string functions it will work on anywhere.

<?php
    function random_string($max = 20){
        $chars = explode(" ", "a b c d e f g h i j k l m n o p q r s t u v w x y z 0 1 2 3 4 5 6 7 8 9");
        for($i = 0; $i < $max; $i++){
            $rnd = array_rand($chars);
            $rtn .= base64_encode(md5($chars[$rnd]));
        }
        return substr(str_shuffle(strtolower($rtn)), 0, $max);
    }
?>

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-12

m ¶

17 years ago


Regarding the code for the function beginsWith($str, $sub), I found that it has problems when only one character is present after the string searched for. I found that this works better instead:

<?php
function beginsWith($str, $sub) {
    return (strncmp($str, $sub, strlen($sub)) == 0);
}
?>

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Stephen Dewey ¶

15 years ago


If you want a function to return all text in a string up to the Nth occurrence of a substring, try the below function.

Works in PHP >= 5.

(Pommef provided another sample function for this purpose below, but I believe it is incorrect.)

<?php

// Returns all of $haystack up to (but excluding) the $n_occurrence occurrence of $needle. Therefore:
//        If there are < $n_occurrence occurrences of $needle in $haystack, the entire string will be returned.
//        If there are >= $n_occurrence occurrences of $needle in $haystack, the returned string will end before the $n_occurrence'th needle.
// This function only makes sense for $n_occurrence >= 1
function nsubstr($needle, $haystack, $n_occurrence)
{
    // After exploding by $needle, every entry in $arr except (possibly) part of the last entry should have its content returned.
    $arr = explode($needle,$haystack,$n_occurrence);
    // Examine last entry in $arr. If it contains $needle, cut out all text except for the text before $needle.
    $last = count($arr) - 1;
    $pos_in_last = strpos($arr[$last],$needle);
    
    if ($pos_in_last !== false)
        $arr[$last] = substr($arr[$last],0,$pos_in_last);
    
    return implode($needle,$arr);
}

$string = 'd24jkdslgjldk2424jgklsjg24jskgldjk24';

print 'S:  ' . $string . '<br>';
print '1: ' . nsubstr('24',$string,1) . '<br>';
print '2: ' . nsubstr('24',$string,2) . '<br>';
print '3: ' . nsubstr('24',$string,3) . '<br>';
print '4: ' . nsubstr('24',$string,4) . '<br>';
print '5: ' . nsubstr('24',$string,5) . '<br>';
print '6: ' . nsubstr('24',$string,6) . '<br>';
print '7: ' . nsubstr('24',$string,7) . '<br>';

/*
// prints:
S: d24jkdslgjldk2424jgklsjg24jskgldjk24
1: d
2: d24jkdslgjldk
3: d24jkdslgjldk24
4: d24jkdslgjldk2424jgklsjg
5: d24jkdslgjldk2424jgklsjg24jskgldjk
6: d24jkdslgjldk2424jgklsjg24jskgldjk24
7: d24jkdslgjldk2424jgklsjg24jskgldjk24
*/

?>

Note that this function can be combined with wordwrap() to accomplish a routine but fairly difficult web design goal, namely, limiting inline HTML text to a certain number of lines. wordwrap() can break your string using <br>, and then you can use this function to only return text up to the N'th <br>.

You will still have to make a conservative guess of the max number of characters per line with wordwrap(), but you can be more precise than if you were simply truncating a multiple-line string with substr().

See example:

<?php

$text = 'Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Pellentesque id massa. Duis sollicitudin ipsum vel diam. Aliquam pulvinar sagittis felis. Nullam hendrerit semper elit. Donec convallis mollis risus. Cras blandit mollis turpis. Vivamus facilisis, sapien at tincidunt accumsan, arcu dolor suscipit sem, tristique convallis ante ante id diam. Curabitur mollis, lacus vel gravida accumsan, enim quam condimentum est, vitae rutrum neque magna ac enim.';

$wrapped_text = wordwrap($text,100,'<br>',true);

$three_lines = nsubstr('<br>',$wrapped_text,3);

print '<br><br>' . $three_lines;

$four_lines = nsubstr('<br>',$wrapped_text,4);

print '<br><br>' . $four_lines;

/*
prints:

Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Pellentesque id massa. Duis sollicitudin
ipsum vel diam. Aliquam pulvinar sagittis felis. Nullam hendrerit semper elit. Donec convallis
mollis risus. Cras blandit mollis turpis. Vivamus facilisis, sapien at tincidunt accumsan, arcu

Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Pellentesque id massa. Duis sollicitudin
ipsum vel diam. Aliquam pulvinar sagittis felis. Nullam hendrerit semper elit. Donec convallis
mollis risus. Cras blandit mollis turpis. Vivamus facilisis, sapien at tincidunt accumsan, arcu
dolor suscipit sem, tristique convallis ante ante id diam. Curabitur mollis, lacus vel gravida

*/

?>

down

-16

administrador(ensaimada)sphoera(punt)com ¶

18 years ago


I've prepared this simple function to obtain a string delimited between tags (not only XML tags!). Anybody needs something like this?.

<?php

function get_string_between($string, $start, $end){
    $string = " ".$string;
     $ini = strpos($string,$start);
     if ($ini == 0) return "";
     $ini += strlen($start);     
     $len = strpos($string,$end,$ini) - $ini;
     return substr($string,$ini,$len);
}

$string = "this [custom] function is useless!!";
echo get_string_between($string,"[","]");
// must return "custom";
?>
more functions at http://www.sphoera.com

down

-13

rh at richardhoward dot net ¶

19 years ago


<?php
/**
Utility class: static methods for cleaning & escaping untrusted (i.e.
user-supplied) strings.

Any string can (usually) be thought of as being in one of these 'modes':

pure = what the user actually typed / what you want to see on the page /
       what is actually stored in the DB
gpc  = incoming GET, POST or COOKIE data
sql  = escaped for passing safely to RDBMS via SQL (also, data from DB
       queries and file reads if you have magic_quotes_runtime on--which
       is rare)
html = safe for html display (htmlentities applied)

Always knowing what mode your string is in--using these methods to
convert between modes--will prevent SQL injection and cross-site scripting.

This class refers to its own namespace (so it can work in PHP 4--there is no
self keyword until PHP 5). Do not change the name of the class w/o changing
all the internal references.

Example usage: a POST value that you want to query with:
$username = Str::gpc2sql($_POST['username']);
*/

//This sets SQL escaping to use slashes; for Sybase(/MSSQL)-style escaping
// ( ' --> '' ), set to true.
define('STR_SYBASE', false);

class Str {
    function gpc2sql($gpc, $maxLength = false)
    {
        return Str::pure2sql(Str::gpc2pure($gpc), $maxLength);
    }
    function gpc2html($gpc, $maxLength = false)
    {
        return Str::pure2html(Str::gpc2pure($gpc), $maxLength);
    }
    function gpc2pure($gpc)
    {
        if (ini_get('magic_quotes_sybase'))
            $pure = str_replace("''", "'", $gpc);
        else $pure = get_magic_quotes_gpc() ? stripslashes($gpc) : $gpc;
        return $pure;
    }
    function html2pure($html)
    {
        return html_entity_decode($html);
    }
    function html2sql($html, $maxLength = false)
    {
        return Str::pure2sql(Str::html2pure($html), $maxLength);
    }
    function pure2html($pure, $maxLength = false)
    {
        return $maxLength ? htmlentities(substr($pure, 0, $maxLength))
                          : htmlentities($pure);
    }
    function pure2sql($pure, $maxLength = false)
    {
        if ($maxLength) $pure = substr($pure, 0, $maxLength);
        return (STR_SYBASE)
               ? str_replace("'", "''", $pure)
               : addslashes($pure);
    }
    function sql2html($sql, $maxLength = false)
    {
        $pure = Str::sql2pure($sql);
        if ($maxLength) $pure = substr($pure, 0, $maxLength);
        return Str::pure2html($pure);
    }
    function sql2pure($sql)
    {
        return (STR_SYBASE)
               ? str_replace("''", "'", $sql)
               : stripslashes($sql);
    }
}
?>

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-18

php at moechofe dot com ¶

19 years ago


<?php
  /*
  * str_match
  *
  * return a string with only cacacteres defined in a expression return false if the expression is not valid
  *
  * @param $str string the string
  * @param $match the expression based on the class definition off a PCRE regular expression.
  *   the '[', ']', '\' and '^' at class start need to be escaped.
  *   like : -a-z0-9_@.
  */
  function str_match( $str, $match )
  {
    $return = '';
    if( eregi( '(.*)', $match, $class ) )
    {
      $match = '['.$regs[1].']';
      for( $i=0; $i<strlen($str); $i++ )
      if( ereg( '['.$class[1].']', $str[$i] ) )
      $return .= $str{$i};
      return $return;
    }
    else return false;
  }

  /*
  * example
  * accept only alphanum caracteres from the GET/POST parameters 'a'
  */

  if( ! empty($_REQUEST['a']) )
    $_REQUEST['a'] = str_match( $_REQUEST['a'], 'a-zA-Z0-9' );
  else
    $_REQUEST['a'] = 'default';
?>

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-14

Pommef ¶

19 years ago


Example: Give me everything up to the fourth occurance of '/'.

<?php

   $haystack = "/home/username/www/index.php";
   $needle = "/";
  
   function strnpos($haystack, $needle, $occurance, $pos = 0) {
        
        $res = implode($needle,$haystack);
        
        $res = array_slice($res, $pos,  $occurance);
        
        return explode ($needle,$res); 
    } 
?>

down

-21

Tomek Rychtyk ¶

12 years ago


Get the intersection of two strings using array_intersect

<?php

function string_intersect($string1, $string2)
{
    $array1 = $array2 = array();

    for($i = 0, $j = 0, $s1_len = strlen($string1), $s2_len = strlen($string2);($i < $s1_len) || ($j < $s2_len); $i++, $j++) {
        if($i < $s1_len) {
            $array1[] = $string1[$i];
        }
        if($j < $s2_len) {
            $array2[] = $string2[$j];
        }
    }

    return implode('', array_intersect($array1, $array2));
}

?>

For more advanced comparison you can use array_uintersect as well.

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