Flash Database: Saving Data at Server Side

function saveData(){
  global $file_data;
  
  
  if(number_format($_GET['num']) < 1) die("registered=false");
  
  // open file
  $fp_array 	= file($file_data);
  $fp 			= fopen($file_data,"r+");

  $temp_string 	= "";
  
  // read file
  foreach($fp_array as $key => $value){
    // extract each lines
	$line 	=	explode('=', $value); 
	$name 	= 	$line[0];
	$val	= 	eregi_replace("\r\n","",$line[1]);
	
	// if as votes
	if(substr($name,0,5)=='votes'){
	  $val	= 	(int)eregi_replace("\r\n","",$line[1]);
	  $match=	(int)(substr($name,5,2));

	  // if the index same as choice, add 1
	  if($match == $_GET['num']){
	    $val++;
	  }
	}
	
	// write this line
	$temp_string .= $name."=".$val."\r\n";
  }

  fwrite($fp, $temp_string);
  fclose($fp);  
}