How to modify the suffix of a specified file in php

This article mainly introduces the method of modifying the specified file suffix in PHP. The function foreachDir in the article can realize the functions of detecting, reading, opening and file suffix replacement of file directories. It is a very practical skill. Friends who need it can refer to it

Due to project requirements, I need to change the asp suffix to php, but I am too lazy to change it one by one. I also feel that php, like Qt, is a high-level language. Generally, high-level languages ​​provide functions for adding, deleting, modifying and checking the obtained content. After some information search and code testing, I summarized the method of modifying the specified file suffix in PHP and shared it with everyone.

Goal: Change the asp suffix in the current directory to php without affecting other "files in suffix format", and it is only for the "current folder" and does not modify the files in the folders contained in the current folder.

The specific function code is as follows:

<?php 
function foreachDir($dirname)
{ 
if(!is_dir($dirname))
{
  echo "{$dirname} not effective dir";
  exit();
}
 $handle=opendir($dirname); //打开目录

while (($file = readdir($handle))!==false) //读取目录
{ 
 if($file!="." && $file!=&#39;..&#39;)
 { 
  if(is_dir($dirname.$file))
 { 
  echo $dirname.$file."<br/>"; 
  //foreachDir($dirname.$file); //如果注释号去掉，将会递归修改文件夹内的文件夹文件
 }
  else
 { 
  echo "--".$dirname."/".$file."<br/>"; 
  $temp = substr($file, strrpos($file, &#39;.&#39;)+1); //获取后缀格式
   if ($temp == "asp") 
   {
  $pos = strripos($file,&#39;.&#39;); //获取到文件名的位置
  $filename = substr($file,0,$pos); //获取文件名
  rename($dirname.&#39;/&#39;.$file,$dirname.&#39;/&#39;.$filename.&#39;.php&#39;); //替换为php后缀格式。
   }
 } 
 } 
 } 
} 
foreachDir(&#39;../traverseMendFilename&#39;);
?>

Interested friends can test run and expand and improve the examples in this article. I believe it will be helpful for everyone to learn PHP programming.

Also: Attached are four methods for obtaining file extensions for your reference.