There was a change in PHP 4.2.3 that can cause a warning message
to be generated when using stristr(), even though no message was
generated in older versions of PHP.
The following will generate a warning message in 4.0.6 and 4.2.3:
stristr("haystack", "");
OR
$needle = ""; stristr("haystack", $needle);
This will _not_ generate an "Empty Delimiter" warning message in
4.0.6, but _will_ in 4.2.3:
unset($needle); stristr("haystack", $needle);
Here's a URL that documents what was changed:
http://groups.google.ca/groups?selm=cvshholzgra1031224321%40cvsserver
Descripción
Devuelve todo de haystack iniciando desde e incluyendo la primera
aparición de needle hasta el final.
Parámetros
-
haystack -
El string en donde buscar
-
needle -
Si
needleno es una cadena, se convierte a un entero y se aplica como el valor ordinal de un carácter. Este comportamiento está obsoleto a partir de PHP 7.3.0, por lo que su uso está totalmente desaconsejado. Dependiendo del comportamiento previsto,needledeberá ser convertido explícitamente a string, o realizar una llamada explícita a chr(). -
before_needle -
Si es
true, stristr() devuelve la parte delhaystackanterior a la primera aparición delneedle(excluyendo el needle).
needle y haystack
se examinan de una manera insensible a mayúsculas y minúsculas.
Valores devueltos
Devuelve el substring coincidente. Si no se encuentra needle,
devuelve false.
Historial de cambios
| Versión | Descripción |
|---|---|
| 5.3.0 |
Agregado el parámetro opcional before_needle.
|
| 4.3.0 | stristr() se hizo seguro a nivel binario. |
Ejemplos
Ejemplo #1 Ejemplo de stristr()
<?php
$email = 'USER@EXAMPLE.com';
echo stristr($email, 'e'); // salida ER@EXAMPLE.com
echo stristr($email, 'e', true); // A partir de PHP 5.3.0, salida US
?>
Ejemplo #2 Probando si un string se encuentra o no
<?php
$string = 'Hello World!';
if(stristr($string, 'earth') === FALSE) {
echo '"earth" not found in string';
}
// salida: "earth" not found in string
?>
Ejemplo #3 Utilizando un needle no "string"
<?php
$string = 'APPLE';
echo stristr($string, 97); // 97 = a minúscula
// salida: APPLE
?>Notas
Nota: Esta función es segura binariamente.
Ver también
- strstr() - Encuentra la primera aparición de un string
- strrchr() - Encuentra la última aparición de un caracter en un string
- stripos() - Encuentra la posición de la primera aparición de un substring en un string sin considerar mayúsculas ni minúsculas
- strpbrk() - Buscar una cadena por cualquiera de los elementos de un conjunto de caracteres
- preg_match() - Realiza una comparación con una expresión regular
add a note
User Contributed Notes 8 notes
dpatton.at.confluence.org ¶
22 years ago
giz at gbdesign dot net ¶
17 years ago
Just been caught out by stristr trying to converting the needle from an Int to an ASCII value.
Got round this by casting the value to a string.
<?php
if( !stristr( $file, (string) $myCustomer->getCustomerID() ) ) {
// Permission denied
}
?>
Techdeck at Techdeck dot org ¶
22 years ago
An example for the stristr() function:
<?php
$a = "I like php";
if (stristr("$a", "LikE PhP")) {
print ("According to \$a, you like PHP.");
}
?>
It will look in $a for "like php" (NOT case sensetive. though, strstr() is case-sensetive).
For the ones of you who uses linux.. It is similiar to the "grep" command.
Actually.. "grep -i".
notepad at codewalkers dot com ¶
19 years ago
<?php
function stristr_reverse($haystack, $needle) {
$pos = stripos($haystack, $needle) + strlen($needle);
return substr($haystack, 0, $pos);
}
$email = 'USER@EXAMPLE.com';
echo stristr_reverse($email, 'er');
// outputs USER
?>
jukka ¶
10 years ago
I think there is a bug in php 5.3 in stristr with uppercase Ä containing other character
http://pastebin.com/5bP6uztY
if you search only with täry it works, but as soon as the word is tärylä it does not. TÄRYL works fine
tomas dot nesrovnal at yourspirit dot cz ¶
15 years ago
Active item item in menu:
<?php
function aim($page) {
if(stristr($_SERVER['REQUEST_URI'], $page)) {
return ' class="active"';
}
}
?>
usage:
<style type="text/css">
.active {color: red;}
</style>
<?php
print '<a href="http://example.com/page/hello-world/"'. aim('hello-world') .'>HW</a>';
?>
art at awilton dot dotcom ¶
19 years ago
handy little bit of code I wrote to take arguments from the command line and parse them for use in my apps.
<?php
$i = implode(" ",$argv); //implode all the settings sent via clie
$e = explode("-",$i); // no lets explode it using our defined seperator '-'
//now lets parse the array and return the parameter name and its setting
// since the input is being sent by the user via the command line
//we will use stristr since we don't care about case sensitivity and
//will convert them as needed later.
while (list($index,$value) = each($e)){
//lets grap the parameter name first using a double reverse string
// to get the begining of the string in the array then reverse it again
// to set it back. we will also "trim" off the "=" sign
$param = rtrim(strrev(stristr(strrev($value),'=')),"=");
//now lets get what the parameter is set to.
// again "trimming" off the = sign
$setting = ltrim(stristr($value,'='),"=");
// now do something with our results.
// let's just echo them out so we can see that everything is working
echo "Array index is ".$index." and value is ".$value."\r\n";
echo "Parameter is ".$param." and is set to ".$setting."\r\n\r\n";
}
?>
when run from the CLI this script returns the following.
[root@fedora4 ~]# php a.php -val1=one -val2=two -val3=three
Array index is 0 and value is a.php
Parameter is and is set to
Array index is 1 and value is val1=one
Parameter is val1 and is set to one
Array index is 2 and value is val2=two
Parameter is val2 and is set to two
Array index is 3 and value is val3=three
Parameter is val3 and is set to three
[root@fedora4 ~]#
greg at no_ggmac_reply dot com ¶
13 years ago
Beware the example given here:
if stristr($message,'viagra')
or stristr($message,'cialis')
)
{
die();
}
stristr does not search for words, it finds matching substrings. So, for example, the check for 'cialis' will trigger on 'specialist'
