PHP初记｜中英混合字符串截取

function truncate($string, $len, $wordsafe = FALSE) {	$slen = strlen($string);	if ($slen <= $len) {		return $string;	}	if ($wordsafe) {		while (($string[-- $len] != ' ') && ($len > 0)) {		};	}	if ((ord($string[$len]) < 0x80) || (ord($string[$len]) >= 0xC0)) {		return substr($string, 0, $len) . "...";	}	while (ord($string[-- $len]) < 0xC0) {	};	return substr($string, 0, $len) . "...";}

function truncate($string, $len, $cnCharWidth = 2) {	$len = $len * $cnCharWidth;	$suffix = "...";	$newStr = "";	for ($i = 0, $j = 0; $i < $len; $i++, $j++) {		if (!isset($string[$j])) {			$suffix = "";			break;		}		$start = $j;		while ($j < ($start +3) && !(ord($string[$j]) < 0x80)) {			$j++;		}		if ($start == $j) {			$charLen = 1;		}		else {			$i = $i + 1;			$j--;			$charLen = 3;		}		$newStr .= substr($string, $start, $charLen);	}	return $newStr . $suffix;}