According to the document of PHP official website, http://php.net/manual/en/function.str-split.php
str_split
(PHP 5) str_split — Convert a string to an array
So, it’s only for PHP5+. In PHP4, we use this function below:
<?
if (!function_exists('str_split')) {
function str_split($text, $split = 1)
{
if (!is_string($text))
return false;
if (!is_numeric($split) && $split < 1)
return false;
$len = strlen($text);
$array = array();
$i = 0;
while ($i < $len) {
$key = null;
for ($j = 0; $j < $split; $j += 1) {
$key .= $text{$i};
$i += 1;
}
$array[] = $key;
}
return $array;
}
}
?>
or these functions below:
<?
if (!function_exists('str_split')) {
function str_split($string, $chunksize = 1)
{
preg_match_all('/(' . str_repeat('.', $chunksize) . ')/Us', $string, $matches);
return $matches[1];
}
}
?>
<?php
if (!function_exists('str_split')) {
function str_split($string, $length = 1)
{
if (strlen($string) > $length || !$length) {
do {
$c = strlen($string);
$parts[] = substr($string, 0, $length);
$string = substr($string, $length);
} while ($string !== false);
} else {
$parts = array($string);
}
return $parts;
}
}
?>
