A small example of php file operation

<?php
    ini_set('memory_limit', '-1');        //  
    ini_set("max_execution_time", "3600"); //设置超时时间  
      
    $filep='qq.txt';
      
    $str=file('qq.txt');  
     $lineCount = 0;  
       foreach( $str AS $line ) {  
           $line = str_replace( "\t", "    ", $line );  
            $tr = trim( $line );  
                if ( preg_match( "/\\*|^\*|^ {1,}\*|\/\*|\*\/|^ {1,}\/\/|^\/\//", $line ) || $tr === "" ) {  
                continue;  
                }  
                $lineCount++;  
              
            $line = str_replace( "\r", "", $line );  
             $line = str_replace( "\n", "", $line );  
               if($lineCount<5){  
                is_m('5.txt',"".$line."@qq.com\n");  
                 continue;  
               }elseif ($lineCount <10){  
                  is_m('10.txt',"".$line."@qq.com\n");  
                    break;  
               }              
            }
        function is_m($filename,$c){  
             $handle = fopen($filename, "a");  
             if ($handle) {  
             fwrite($handle, $c );  
             fclose($handle);  
            }
       }  
  ?>