is_utf8 in PHP
By: rodrigo in PHP Tutorials on 2011-07-31
I've been working on a is_utf8 function and wanted to post it here, in addition to others i also took in consideration the 5000 char bug:
<?php
define('_is_utf8_split',5000);
function is_utf8($string) { // v1.01
if (strlen($string) > _is_utf8_split) {
// Based on: http://mobile-website.mobi/php-utf8-vs-iso-8859-1-59
for ($i=0,$s=_is_utf8_split,$j=ceil(strlen($string)/_is_utf8_split);$i < $j;$i++,$s+=_is_utf8_split) {
if (is_utf8(substr($string,$s,_is_utf8_split)))
return true;
}
return false;
} else {
// From http://w3.org/International/questions/qa-forms-utf-8.html
return preg_match('%^(?:
[x09x0Ax0Dx20-x7E] # ASCII
| [xC2-xDF][x80-xBF] # non-overlong 2-byte
| xE0[xA0-xBF][x80-xBF] # excluding overlongs
| [xE1-xECxEExEF][x80-xBF]{2} # straight 3-byte
| xED[x80-x9F][x80-xBF] # excluding surrogates
| xF0[x90-xBF][x80-xBF]{2} # planes 1-3
| [xF1-xF3][x80-xBF]{3} # planes 4-15
| xF4[x80-x8F][x80-xBF]{2} # plane 16
)*$%xs', $string);
}
}
?>
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