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array preg_split ( string $pattern , string $subject [, int $limit = -1 [, int $flags = 0 ]] )

<?php
// Split the phrase by comma or whitespace (including " ", \r, \t, \n, \f)
$keywords = preg_split("/[\s,]+/", "hypertext language, programming");
print_r($keywords);
?>

Array
(
    [0] => hypertext
    [1] => language
    [2] => programming
)

<?php
$str = 'tutorialpro';
$chars = preg_split('//', $str, -1, PREG_SPLIT_NO_EMPTY);
print_r($chars);
?>

Array
(
    [0] => t
    [1] => u
    [2] => t
    [3] => o
    [4] => r
    [5] => i
    [6] => a
    [7] => l
    [8] => p
    [9] => r
    [10] => o
)

<?php
$str = 'hypertext language programming';
$chars = preg_split('/ /', $str, -1, PREG_SPLIT_OFFSET_CAPTURE);
print_r($chars);
?>

Array
(
    [0] => Array
        (
            [0] => hypertext
            [1] => 0
        )

    [1] => Array
        (
            [0] => language
            [1] => 10
        )

    [2] => Array
        (
            [0] => programming
            [1] => 19
        )
)