Can’t delete images from folder with PHP using Unlink function

I am trying to execute a php process file, in a folder where there’s this php file and other files (can be images, text document, pdf, other code files, etc.)

I need to generate a process where detects main image formats and deletes it automatically.

I have this code:

$dirPath = '.';
$files = scandir($dirPath);  
foreach ($files as $file) {
    $filePath = $dirPath . '/' . $file;
    if (is_file($filePath)) {
        //echo $file . "<br>";
        $file_parts = explode(".", $file);
        $file_extension = $file_parts[1];
        
        $image_extensions = array( "jpg", "png", "jpeg", "tiff", "webm", "jpeg", "gif" );
        
        echo "<br />Found this file: ".$file;
        foreach($image_extensions as $i_e){
            if (strcmp($file_extension, strval($i_e)) === 0) {
                chmod ($file, 0777);
                unlink($file);
                echo 'Deleted for being an image.';
            }
        }

    }
}

But never deletes it. Files have a permissions level of 0644.
Is this a problem? Can I change permissions?
Could be another reason.

All files are in the same folder.
Why files isn’t being deleted?

Thanks in advance.

I was trying to delete all images in a folder and isn’t working.