Script for convert images to WebP

convert.php

<?php

function convertDir($path){
    // echo "Search In $path\n";

    $items = scandir($path);
    foreach($items as $item){
        if($item === '.' || $item === '..'){
            continue;
        }

        $itemPath = $path.'/'.$item;
        if(is_dir($itemPath)){
            convertDir($itemPath);
        }else{
            $extention = strtolower(substr($item, -4));
            if($extention === '.jpg' || $extention === 'jpeg' || $extention === '.png'){
                convertToWebP($itemPath);
            }
        }
    }
}

function convertToWebP($file){
    $outputFile = $file.'.webp';

    if(!file_exists($outputFile) || filectime($outputFile) < filectime($file)){
        echo "Convert $file\n";
        system ('cwebp "'.$file.'" -o "'.$outputFile.'" > /dev/null 2>&1');
    }
    // echo ('cwebp "'.$file.'" -o "'.$file.'.webp"'."\n");
}


$images = convertDir('.');
echo "Completed\n";

nginx.conf

# Modified from https://wordpress.org/plugins/webp-express/#%0Ai%20am%20on%20nginx%20or%20openresty%0A

location ~* .*\.(png|jpe?g)$ {
    try_files      $uri;
    add_header Vary Accept;
    add_header Handle WebP;
    expires 365d;

    if ($http_accept ~* "webp"){
        set $whattodo A;
    }
    if (-f $request_filename.webp) {
        set $whattodo  "${whattodo}B";
    }
    if ($whattodo = AB) {
        rewrite ^(.*) $1.webp last;
    }
}