如何使用php只保留特定文件并删除目录中的其他文件？

问题描述：

How to use php keep only specific file and remove others in directory?

example:
1/1.png, 1/2.jpeg, 1/5.png ...

the file number, and file type is random like x.png or x.jpeg, but I have a string 2.jpeg the file need to keep.

any suggestion how to do this??

Thanks for reply, now I coding like below but the unlink function seems not work delete anything.. do I need change some setting? I'm using Mamp

UPDATE

// explode string <img src="u_img_p/5/x.png">
$content_p_img_arr = explode('u_img_p/', $content_p_img);
$content_p_img_arr_1 = explode('"', $content_p_img_arr[1]);    // get 5/2.png">
$content_p_img_arr_2 = explode('/', $content_p_img_arr_1[0]);    // get 5/2.png
print $content_p_img_arr_2[1];    // get 2.png   < the file need to keep

$dir = "u_img_p/".$id;  
if ($opendir = opendir($dir)){
    print $dir;
    while(($file = readdir($opendir))!= FALSE )
        if($file!="." && $file!= ".." && $file!= $content_p_img_arr_2[1]){
            unlink($file);
            print "unlink";
            print $file;
        }
    }
}

I change the code unlink path to folder, then it works!!

 unlink("u_img_p/".$id.'/'.$file);

答

 $dir = "your_folder_path";  
 if ($opendir = opendir($dir)){
    //read directory
     while(($file = readdir($opendir))!= FALSE ){
      if($file!="." && $file!= ".." && $file!= "2.jpg"){
       unlink($file);
      }
     }
   }

答

http://php.net/manual/en/function.scandir.php

This will get all files in a directory into an array, then you can run a foreach() on the array and look for patterns / matches on each file.

unlink() can be used to delete the file.

$dir = "/pathto/files/"
$exclude[] = "2.jpeg";
foreach(scandir($dir) as $file) {
 if (!in_array($file, $exclude)) {
  unlink("$dir/$file");
 }
}

Simple and to the point. You can add multiple files to the $exclude array.

答

function remove_files( $folder_path , $aexcludefiles )
{
    if (is_dir($folder_path))
    {
        if ($dh = opendir($folder_path))
        {
            while (($file = readdir($dh)) !== false)
            {
                if( $file == '.' || $file == '..' )
                    continue ;

                if( in_array( $file , $aexcludefiles ) )
                    continue ;

                $file_path = $folder_path."/".$file ;
                if( is_link( $file_path ) )
                    continue ;

                unlink( $file_path ) ;
            }

            closedir($dh);
        }
    }
}


$aexcludefiles = array( "2.jpeg" )
remove_files( "1" , $aexcludefiles ) ;

答

I'm surprised people don't use glob() more. Here is another idea:

$dir = '/absolute/path/to/u_img_p/5/';
$exclude[] = $dir . 'u_img_p/5/2.jpg';

$filesToDelete = array_diff(glob($dir . '*.jpg'), $exclude);
array_map('unlink', $filesToDelete);

First, glob() returns an array of files based on the pattern provided to it. Next, array_diff() finds all the elements in the first array that aren't in the second. Finally, use array_map() with unlink() to delete all but the excluded file(s). Be sure to use absolute paths*.

You could even make it into a helper function. Here's a start:

<?php
    /**
     * @param  string $path
     * @param  string $pattern
     * @param  array $exclude
     * @return bool
     */
    function deleteFiles($path, $pattern, $exclude = [])
    {
        $basePath = '/absolute/path/to/your/webroot/or/images/or/whatever/';
        $path = $basePath . trim($path, '/');
        if (is_dir($path)) { 
            array_map(
                'unlink', 
                array_diff(glob($path . '/' . $pattern, $exclude)
            );

            return true;
        }

        return false;
    }

unlink() won't work unless the array of paths returned by glob() happen to be relative to where unlink() is called. Since glob() will return only what it matches, it's best to use the absolute path of the directory in which your files to delete/exclude are contained.See the docs and comments on how glob() matches and give it a play to see how it works.

如何使用php只保留特定文件并删除目录中的其他文件？

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