How to batch modify file names in PHP

This article mainly introduces the method of batch modifying file names in PHP, and analyzes the principles and implementation techniques of PHP's recursion, traversal, and modification of files and directories in the form of examples. Friends in need can refer to the following

The example in this article describes the method of batch modifying file names in PHP. Share it with everyone for your reference, the details are as follows:

Here we use an example written by Battlefield to analyze in detail the ideas and precautions for using PHP to batch modify file names.

You will see from this example, How PHP determines whether a path is a directory, how to use PHP to obtain the file name and file extension in the path, and the basic application of the random function rand. And the core content of this program is the basic application of recursive functions.

Program functions: Use PHP directory and file functions to traverse all files and folders in the directory given by the user, and modify the file name;

First determine the file name given by the user Is the directory a legal directory?

We are only modifying the file name in a narrow sense (excluding directories), so in the program we must determine whether it is a directory. If it is a directory, we will open the directory - thus achieving Iterate through all files in the directory. If not, we will modify the original file name with a random name (it is actually unscientific to use random numbers as names, but this is not our focus).

The specific program is as follows:

<?php
//利用PHP目录和文件函数遍历用户给出目录的所有的文件和文件夹，修改文件名称
function fRename($dirname){
 if(!is_dir($dirname)){
 echo "{$dirname}不是一个有效的目录！";
 exit();
 }
 $handle = opendir($dirname);
 while(($fn = readdir($handle))!==false){
 if($fn!=&#39;.&#39;&&$fn!=&#39;..&#39;){
  $curDir = $dirname.&#39;/&#39;.$fn;
  if(is_dir($curDir)){
  fRename($curDir);
  }
  else{
  $path = pathinfo($curDir);
  $newname = $path[&#39;dirname&#39;].&#39;/&#39;.rand(0,100).&#39;.&#39;.$path[&#39;extension&#39;];
  rename($curDir,$newname);
  echo $curDir.&#39;---&#39;.$newname."<br>";
  }
 }
 }
}
//给出一个目录名称调用函数
fRename(&#39;pl&#39;);
?>

Program analysis:

In line 4 we use The is_dir function determines whether the directory given by the user is a valid directory name; because we are learning, we write it simply. If you want to put it on the server for everyone to use, you must carefully verify the input data - for example , whether this directory is allowed to be modified by users, etc...

Note that the judgment on line 9 of the function must be judged by congruence (PHP congruence symbol === three equal signs, not congruent! == one exclamation mark Two equal signs), otherwise if there is a file with a name of 0 (zero), the program will terminate unexpectedly;

Line 12, if the file read is a directory, call the function itself here, Implement recursion of the function;

Pay attention to the usage of the pathinfo function in line 16. This function returns an array with three elements. The three elements are:

The directory name of the Dirname path, and the basename path. Contains the name of the file and the extension of the extension file. Please refer to the relevant parts of the manual for the specific usage of this function.

In line 17 of the program, PHP's random number function rand is used. This is a basic random function. For other random functions, please refer to the manual of this site http://shouce.jb51.net/php5/.

Note: Be sure to determine whether the file name read with PHP's readdir function is "." and ".." This is very important, why? You can give it a try!

#The above is the entire content of this article, I hope it will be helpful to everyone's study.

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