按长度截取字符串(针对UTF-8)代码,PHP代码库,德仔网

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【PHP】按长度截取字符串(针对UTF-8)

作者:Dezai.CN / 发布于2013/10/22/ 539


	/*********************************************************************
	*
	* Func Name : SubStrEx
	*
	* Description :
	* 按长度截取字符串
	*
	*
	* Parameters :
	* $sString[string] : 字符串
	* $nLength[int] : 要取长度
	* $sDot[string="..."] : 截断符
	* $sCharset[string="UTF-8"] : 编码
	*
	* Returns : [bool]保存结果
	*
	*********************************************************************/
	function SubStrEx ($sString, $nLength, $sDot = "...", $sCharset = "UTF-8") {
	 if (strlen($sString) <= $nLength) {
	 return $sString;
	 }

	 $sString = str_replace(array("&", "\"", "<", ">"), array("&", "\"", "<", ">"), $sString);

	 $sStrcut = "";
	 if (strtoupper($sCharset) == "UTF-8") {

	 $nPos = 0;
	 $nWordLen = 0;
	 $noc = 0; // 单字节字符+1,多字节+2(将非单字节字符的长度当做是2[应该是视觉感觉吧])
	 while ($nPos < strlen($sString)) {

	 $t = ord($sString[$nPos]);
	 if ($t == 9 || $t == 10 || (32 <= $t && $t <= 126)) {
	 $nWordLen = 1;
	 $noc++;
	 } elseif (194 <= $t && $t <= 223) {
	 $nWordLen = 2;
	 $noc += 2;
	 } elseif (224 <= $t && $t <= 239) {
	 $nWordLen = 3;
	 $noc += 2;
	 } elseif (240 <= $t && $t <= 247) {
	 $nWordLen = 4;
	 $noc += 2;
	 } elseif (248 <= $t && $t <= 251) {
	 $nWordLen = 5;
	 $noc += 2;
	 } elseif ($t == 252 || $t == 253) {
	 $nWordLen = 6;
	 $noc += 2;
	 } else {
	 $nWordLen = 0;
	 }
	
	 $nPos += ($nWordLen > 0) ? $nWordLen : 1;

	 if ($noc >= $nLength) {
	 break;
	 }
	 }
	 if ($noc > $nLength) {
	 $nPos -= $nWordLen;
	 }
	 $sStrcut = substr($sString, 0, $nPos);

	 } else {
	 for ($i = 0; $i < $nLength; $i++) {
	 $sStrcut .= ord($sString[$i]) > 127 ? $sString[$i] . $sString[++ $i] : $sString[$i];
	 }
	 }
	
	 $sStrcut = str_replace(array("&", "\"", "<", ">"), array("&", "\"", "<", ">"), $sStrcut);

	 return $sStrcut . $sDot;
	}

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