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【PHP】截取字符串长度

作者:培政 / 发布于2015/7/22/ 619

提供一些项目中常用的字符串操作功能包括：截取字符串长度、输出转换、随机字符串、全角半角转换、字符集转换、邮箱格式验证、数字转文件大小. 截取字符串长度代码段


	<span style="font-family:SimSun;font-size:12px;">/**
	* 截取长度
	* @param unknown $str
	* @param number $start
	* @param unknown $length
	* @param string $charset
	* @param string $suffix
	* @return mixed|string
	*/
	public static function GetCsubStr($str,$start=0,$length,$charset="utf-8",$suffix=true){
	 $charset=empty($charset)?'utf-8':$charset;
	 $search=array('((\\\$[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)(
	[a&minus;zA&minus;Z0&minus;9\-\.\[
	_\"\'\$\x7f-\xff]+\])*)','/<(\/?)(script|i?frame|style|html|body|title|link|meta|\?|\%)([^>]*?)>/isU', // 去掉 javascript
	 '/(<[^>]*)on[a-zA-Z] \s*=([^>]*>)/isU','/<[\/\!]*?[^<>]*?>/si', // 去掉 HTML 标记
	 '/([\r\n])[\s　]+/i', // 去掉空白字符
	 '/&(quot|#34);/i', // 替换 HTML 实体
	 '/&(amp|#38);/i','/&(lt|#60);/i','/&(gt|#62);/i','/&(nbsp|#160);/i','/&(iexcl|#161);/i','/&(cent|#162);/i','/&(pound|#163);/i','/&(copy|#169);/i','/&#(\d+);/e','/<\?/si','/\?>/si');
	 $replace=array('([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)','<\\1\\2\\3>','\\1\\2',"","\r\n","","","","","","","","","","",'<?','?>');
	 $str=preg_replace($search,$replace,$str);
	 if(function_exists("mb_substr")){
	 if(mb_strlen($str,$charset)<=$length){return $str;}
	 $slice=mb_substr($str,$start,$length,$charset);
	 }else{
	 $re['utf-8']="/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/";
	 $re['gb2312']="/[\x01-\x7f]|[\xb0-\xf7][\xa0-\xfe]/";
	 $re['gbk']="/[\x01-\x7f]|[\x81-\xfe][\x40-\xfe]/";
	 $re['big5']="/[\x01-\x7f]|[\x81-\xfe]([\x40-\x7e]|\xa1-\xfe])/";
	 preg_match_all($re[$charset],$str,$match);
	 if(!empty($match[0])&&count($match[0])<=$length){return $str;}
	 $slice=join("",array_slice($match[0],$start,$length));
	 }
	 if($suffix){return $slice."&hellip;";}
	 return $slice;
	}

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