str_split

(PHP 5, PHP 7, PHP 8)

str_split Converte una stringa in una matrice

Descrizione

str_split(string $string, int $split_length = ?): array

Converte una stringa in una matrice. Se viene passato il parametro opzionale split_length, la matrice restituita sarà composta da segmenti, ciascuno della lunghezza di split_length caratteri, in caso contrario ciascun segmento sarà lungo un carattere.

false è restituito se split_length è minore di 1. Se split_length supera la lunghezza di string, sarà restituita l'intera stringa come primo (ed unico) elemento della matrice.

Example #1 Esempi di uso di str_split()

<?php

$str
= "Hello Friend";

$arr1 = str_split($str);
$arr2 = str_split($str, 3);

print_r($arr1);
print_r($arr2);

?>

L'output potrà essere:

Array
(
    [0] => H
    [1] => e
    [2] => l
    [3] => l
    [4] => o
    [5] =>
    [6] => F
    [7] => r
    [8] => i
    [9] => e
    [10] => n
    [11] => d
)

Array
(
    [0] => Hel
    [1] => lo 
    [2] => Fri
    [3] => end
)

Example #2 Esempi relativi a str_split()

<?php

$str
= "Hello Friend";

echo
$str{0}; // H
echo $str{8}; // i

// Creates: array('H','e','l','l','o',' ','F','r','i','e','n','d')
$arr1 = preg_split('//', $str, -1, PREG_SPLIT_NO_EMPTY);

?>

Vedere anche: chunk_split(), preg_split(), split(), count_chars(), str_word_count() e for.

add a note add a note

User Contributed Notes 3 notes

up
0
Julian
1 year ago
The function str_split() is not 'aware' of words. Here is an adaptation of str_split() that is 'word-aware'.

<?php

$array
str_split_word_aware(
   
'In the beginning God created the heaven and the earth. And the earth was without form, and void; and darkness was upon the face of the deep.',
   
32
);

var_dump($array);

/**
  * This function is similar to str_split() but this function keeps words intact; it never splits through a word.
  *
  * @return array<int, string>
  */
function str_split_word_aware(string $string, int $maxLengthOfLine): array
{
    if (
$maxLengthOfLine <= 0) {
        throw new
RuntimeException(sprintf('The function %s() must have a max length of line at least greater than one', __FUNCTION__));
    }
   
   
$lines = [];
   
$words = explode(' ', $string);

   
$currentLine = '';
   
$lineAccumulator = '';
    foreach (
$words as $currentWord) {

       
$currentWordWithSpace = sprintf('%s ', $currentWord);
       
$lineAccumulator .= $currentWordWithSpace;
        if (
strlen($lineAccumulator) < $maxLengthOfLine) {
           
$currentLine = $lineAccumulator;
            continue;
        }

       
$lines[] = $currentLine;

       
// Overwrite the current line and accumulator with the current word
       
$currentLine = $currentWordWithSpace;
       
$lineAccumulator = $currentWordWithSpace;
    }

    if (
$currentLine !== '') {
       
$lines[] = $currentLine;
    }

    return
$lines;
}

?>

OUTPUT:

<?php

array(5) {
  [
0]=> string(29) "In the beginning God created "
 
[1]=> string(30) "the heaven and the earth. And "
 
[2]=> string(28) "the earth was without form, "
 
[3]=> string(27) "and void; and darkness was "
 
[4]=> string(27) "upon the face of the deep. "
}

?>
up
-7
lskatz at gmail dot com
16 years ago
A good use of str_split is reverse translating an amino acid sequence.

<?php
/* reverse translate an aa sequence using its dna counterpart */
function reverseTranslate($aaSeq,$ntSeq){
 
$nt=str_split($ntSeq,3);
 
$aa=str_split($aaSeq,1);
 
$gapChar=array('*','-');

 
$numAa=count($aa);
 
$ntIndex=0;
 
$newNtSeq="";
  for(
$i=0;$i<$numAa;$i++){
   
// if the aa is a gap, then just put on a gap character
   
if(in_array($aa[$i],$gapChar)){
     
$newNtSeq.='---';
    }
    else{
     
$newNtSeq.=$nt[$ntIndex];
     
$ntIndex++;
    }
  }
  return
$newNtSeq;
}
?>
up
-7
alex-glebe at mail dot ru
1 year ago
Empty string Does'n returns Empty array!

$arr0 = str_split("");
print_r($arr0);

Array
(
    [0] =>
)
To Top