<?php function cn_substr_utf8($str, $start=0,$length) { if(strlen($str) < $start+1) { return ''; } preg_match_all("/./su", $str, $ar); $str = ''; $tstr = ''; //为了兼容mysql教程4.1以下版本,与数据库教程varchar一致,这里使用按字节截取 for($i=0; isset($ar[0][$i]); $i++) { if(strlen($tstr) < $start) { $tstr .= $ar[0][$i]; } else { if(strlen($str) < $length + strlen($ar[0][$i]) ) { $str .= $ar[0][$i]; } else { break; } } } return $str; } $a = '测试这是一个测试'; $a = 'xxxxbbbbbnnn'; $b = cn_substr_utf8($a,0,6,'utf-8'); var_dump($b); ?>
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