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.

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User Contributed Notes 1 note

down

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. "
}

?>

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