重命名PHP中的文件？

Question

I want the script to go into the folder 'images', take every file, cut the first four characters and rename it.

PHP

<?php
$path = './images/';

if ($handle = opendir($path))
{
    while (false !== ($fileName = readdir($handle)))
    {
        if($fileName!=".." && $fileName!=".")
        {
            $newName = substr($fileName, 4);
            $fileName = $path . $fileName;
            $newName = $path . $newName;

            rename($fileName, $newName);
        }
    }

    closedir($handle);
}
?>

This is how the files in the images folder are named:

0,78test-1.jpg
0,32test-2.jpg
0,43test-3.jpg
0,99test-4.jpg

and this is what i want them to look like:

test-1.jpg
test-2.jpg
test-3.jpg
test-4.jpg

The problem is the script cuts out the first 8, 12 or 16 characters, not four as i want it! So when i execute it my files look like this:

-1.jpg
-2.jpg
-3.jpg
-4.jpg

UPDATE

I also tracked the packages to make sure i am not executing the script multiple times. The script is only executed once!

Answer 1

A slightly different approach though essentially the same with the substr part this worked fine for tests on local system.

$dir='c:/temp2/tmpimgs/';
$files=glob( $dir . '*.*' );
$files=preg_grep( '@(\.jpg$|\.jpeg$|\.png$)@i', $files );


foreach( $files as $filename ){
    try{

        $path=pathinfo( $filename, PATHINFO_DIRNAME );
        $name=pathinfo( $filename, PATHINFO_BASENAME );
        $newname=$path . DIRECTORY_SEPARATOR . substr( $name, 4, strlen( $name ) );

        if( strlen( $filename ) > 4 ) rename( $filename, $newname );

    } catch( Exception $e ){
        echo $e->getTraceAsString();
    }
}

Answer 2

You may want to try this little Function. It would do just the proper renaming for you:

<?php

    $path   = './images/';

    function renameFilesInDir($dir){
        $files   = scandir($dir);

        // LOOP THROUGH THE FILES AND RENAME THEM
        // APPROPRIATELY...
        foreach($files as $key=>$file){
            $fileName   = $dir . DIRECTORY_SEPARATOR . $file;
            if(is_file($fileName) && !preg_match("#^\.#", $file)){
                $newFileName = preg_replace("#\d{1,},\d{1,}#", "", $fileName);
                rename($fileName, $newFileName);
            }
        }
    }

    renameFilesInDir($path);

Answer 3

<?php
$path = './images/';

if ($handle = opendir($path))
{
    while (false !== ($fileName = readdir($handle)))
    {
        if($fileName!=".." && $fileName!=".")
        {

//change below line and find first occurence of '-' and then replace everything before this with 'test' or any keyword
            $newName = substr($fileName, 4);

            $fileName = $path . $fileName;
            $newName = $path . $newName;

            rename($fileName, $newName);
        }
    }

    closedir($handle);
}
?>