You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
41 lines
1.2 KiB
41 lines
1.2 KiB
<?php
|
|
|
|
require_once dirname(__FILE__)."/utf8_char2byte_pos.php";
|
|
|
|
/**
|
|
* Returns a part of a UTF-8 string.
|
|
* Unit-tested by Kasper and works 100% like substr() / mb_substr() for full range of $start/$len
|
|
* (http://phpxref.com/xref/moodle/lib/typo3/class.t3lib_cs.php.source.html.gz)
|
|
*
|
|
* @param string UTF-8 string
|
|
* @param integer Start position (character position)
|
|
* @param integer Length (in characters)
|
|
* @return string The substring
|
|
* @see substr()
|
|
* @author Martin Kutschker <martin.t.kutschker@blackbox.net>
|
|
*/
|
|
function utf8_substr($str,$start,$len=null) {
|
|
if (!strcmp($len,'0')) return '';
|
|
|
|
$byte_start = @utf8_char2byte_pos($str,$start);
|
|
if ($byte_start === false) {
|
|
if ($start > 0) {
|
|
return false; // $start outside string length
|
|
} else {
|
|
$start = 0;
|
|
}
|
|
}
|
|
|
|
$str = substr($str,$byte_start);
|
|
|
|
if ($len!=null) {
|
|
$byte_end = @utf8_char2byte_pos($str,$len);
|
|
if ($byte_end === false) // $len outside actual string length
|
|
return $len<0 ? '' : $str; // When length is less than zero and exceeds, then we return blank string.
|
|
else
|
|
return substr($str,0,$byte_end);
|
|
}
|
|
else return $str;
|
|
}
|
|
|
|
?>
|