PHP Convert and Compress Webp All Image Files (Recursive) in Folder

WebpConvert.php

<?php

function getDirContents($dir, &$results = array()) {
    $files = scandir($dir);

    foreach ($files as $key => $value) {
        $path = realpath($dir . DIRECTORY_SEPARATOR . $value);
        if (!is_dir($path)) {
            $results[] = $path;
        } else if ($value != "." && $value != "..") {
            getDirContents($path, $results);
            $results[] = $path;
        }
    }

    return $results;
}
foreach(getDirContents("./") as $imagePath){
    $exp = explode(".",$imagePath);
    if($exp[count($exp) - 1 ] == "png" || $exp[count($exp) - 1 ] == "jpg" ){
        echo $imagePath."\n";
        exec('cwebp -m 6 -pass 10 -mt -lossless '.$imagePath.' -o '.$exp[0].'.webp');
    }
}