php 读取，删除，写入文件实例教程
//-------------------------------删除文件
function delfiletext($filename){
 @unlink($filename);
}
//---------------------------------取得文件内容
function readfiletext($filepath){
 $htmlfp=@fopen($filepath,r);
 while($data=@fread($htmlfp,1000))
 {
  $string.=$data;
 }
 @fclose($htmlfp);
 return $string;
}
//--------------------------------写文件
function writefiletext($filepath,$string){
 global $filechmod;
 $string=stripslashes($string);
 $fp=@fopen($filepath,w);
 @fputs($fp,$string);
 @fclose($fp);
 if(empty($filechmod))
 {
  @chmod($filepath,0777);
 }
}
//--------------------------------写文件
function writefiletext_n($filepath,$string){
 global $filechmod;
 $fp=@fopen($filepath,w);
 @fputs($fp,$string);
 @fclose($fp);
 if(empty($filechmod))
 {
  @chmod($filepath,0777);
 }
}