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PHP初记|中英混合字符串截取

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Release: 2016-06-13 13:08:25
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PHP小记|中英混合字符串截取

常常在WEB页面显示记录列表的时候需要对过长内容进行截取。

采用PHP内置的substr函数对中英混合字符串,特别是字符编码在UTF-8的情况下,支持非常不好,会出现乱码。

所以自己写了一个函数:

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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) . "...";
}
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?

经测试成功。YEAH!

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2012-06-15更新:

?

今天再次写了一个,好处是会把两个英文字符当作一个汉字字符的长度:

所以传递的需要截取多少个汉字的长度

?

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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;
}
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