PHP文件去掉PHP注释空格的函数分析(PHP代码压缩)

functionstrip_whitespace($content){
   $stripStr="";
   //分析php源码
   $tokens=  token_get_all($content);
   $last_space=false;
   for($i=0,$j=count($tokens);$i<$j;$i++){
       if(is_string($tokens[$i])){
           $last_space=false;
           $stripStr.=$tokens[$i];
       }
       else{
           switch($tokens[$i][0]){
               //过滤各种PHP注释
               caseT_COMMENT:
               caseT_DOC_COMMENT:
                   break;
               //过滤空格
               caseT_WHITESPACE:
                   if(!$last_space){
                       $stripStr.="";
                       $last_space=true;
                   }
                   break;
               default:
                   $last_space=false;
                   $stripStr.=$tokens[$i][1];
           }
       }
   }
   return$stripStr;
}