字符串截取函数（避免utf8编码截取半个字符）

 速度撒

/**
 * 截取字符串
 * @params $string:目标字符串；$sublen:截取长度
 */
function CutStr($string, $sublen, $start = 0, $code = 'UTF-8') {

    if($code == 'UTF-8') {
    	
    	$pa = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/";
    	
        // 全局正则表达式匹配

        preg_match_all($pa, $string, $t_string);
    	
    	if( count( $t_string[0] ) - $start > $sublen ) {
    		
    		return join('', array_slice($t_string[0], $start, $sublen))."...";
    		
    	}
    	
    	return join('', array_slice($t_string[0], $start, $sublen));
    	
    } else {
    	
    	$start = $start * 2;
    	$sublen = $sublen * 2;
    	$strlen = strlen($string);
    	$tmpstr = '';
    	
    	for($i=0; $i<$strlen; $i++) {
    		
    		if($i>=$start && $i<($start+$sublen)) {
    			
    			if(ord(substr($string, $i, 1))>129) $tmpstr.= substr($string, $i, 2);
    			
    			else $tmpstr.= substr($string, $i, 1);
    		}
    		
    		if( ord( substr($string, $i, 1 ) ) > 129 ) $i++;
    		
     }
     
     if( strlen($tmpstr) < $strlen ) $tmpstr.= "...";
     
     return $tmpstr;
     
     }
  
  }

 

评论

1 楼 waiting 2010-10-28  

mb_substr()