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