Checking for file-extensions in PHP with Regular expressions

Question

I\'m reading all the files in a single directory and I want to filter on JPG,JPEG,GIF and PNG.

Both capital and small letters. Those are the only files to be accepte

Answer 1

Here are two different ways to compile an array of files by type (conf for demo) from a target directory. I'm not sure which is better performance wise.

    $path    = '/etc/apache2/';
    $conf_files = []; 

    // Remove . and .. from the returned array from scandir
    $files = array_diff(scandir($path), array('.', '..'));
    foreach($files as $file) {
        if(in_array(pathinfo($file, PATHINFO_EXTENSION), ['conf'])) {
            $conf_files[] = $file;   
        }   
    }
    return $conf_files;

This will return the full file path not just the file name

return $files = glob($path . '*.{conf}',GLOB_BRACE);