script_conversion_images_webp_avif.php

<?php

$current_directory = __DIR__;

$support_webp = function_exists('imagewebp');
$support_avif = function_exists('imageavif');

if (!$support_webp && !$support_avif) {
    echo "\n Aucune des deux fonctions imagewebp ou imageavif n'est supportée. \n";
}

$all_directories = getAllDirectoriesAndSubDirectories($current_directory, []);

foreach ($all_directories as $directory) {
    if ($support_avif || $support_webp) {
        $image_filenames = glob($directory.'/*.{gif,jpg,jpeg,png}',  GLOB_BRACE);
        foreach ($image_filenames as $image_filename) {
            $file_extension = strtolower(pathinfo($image_filename, PATHINFO_EXTENSION));
            switch ($file_extension) {
                case 'gif':
                    $image = imagecreatefromgif($image_filename);
                    imagepalettetotruecolor($image);
                    if ($support_webp) {
                        imagewebp($image, $image_filename.'.webp', 90);
                    } else if ($support_avif) {
                        imageavif($image, $image_filename.'.avif', 40);
                    }
                    break;
                case 'png':
                    $image = imagecreatefrompng($image_filename);
                    imagepalettetotruecolor($image);
                    if ($support_webp) {
                        imagewebp($image, $image_filename.'.webp', 90);
                    } else if ($support_avif) {
                        imageavif($image, $image_filename.'.avif', 40);
                    }
                    break;
                case 'jpg':
                case 'jpeg':
                    $image = imagecreatefromjpeg($image_filename);
                    imagepalettetotruecolor($image);
                    if ($support_webp) {
                        imagewebp($image, $image_filename.'.webp', 90);
                    } else if ($support_avif) {
                        imageavif($image, $image_filename.'.avif', 40);
                    }
                    break;
            }
        }
    }
}

function getAllDirectoriesAndSubDirectories($directory, $all_directories) {
    $all_directories[] = $directory;
    $sub_directories = glob($directory.'/*', GLOB_ONLYDIR);

    if (!empty($sub_directories)) {
        foreach ($sub_directories as $sub_directory) {
            $all_directories = getAllDirectoriesAndSubDirectories($sub_directory, $all_directories);
        }
    }

    return $all_directories;
}