Image compression in theme

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Hi, since some years I use tinyPNG for compressing my images (JPG, PNG, WebP) on upload to my WordPress image library.

From begin I wonder that is no function in WordPress. Now I made a small snippet for my theme. Did you think it is good enough?

function optimize_generated_image_sizes($metadata, $attachment_id) {
$upload_dir = wp_get_upload_dir()[‘basedir’]; // Basisverzeichnis des Uploads

foreach ($metadata[‘sizes’] as $size => $size_info) {
$file_path = $upload_dir . ‘/’ . $size_info[‘file’];
$safe_file_path = escapeshellarg($file_path); // Sicheres Escaping des Pfads

// JPEG-Optimierung
if ($size_info[‘mime-type’] === ‘image/jpeg’) {
$jpeg_command = “jpegoptim –strip-all –all-progressive –max=85 $safe_file_path”;
run_secure_command($jpeg_command);
}

// WebP-Konvertierung für JPEG und PNG
if ($size_info[‘mime-type’] === ‘image/jpeg’ || $size_info[‘mime-type’] === ‘image/png’) {
$webp_path = escapeshellarg($file_path . ‘.webp’);
$webp_command = “cwebp -q 80 $safe_file_path -o $webp_path”;
run_secure_command($webp_command);
}
}

return $metadata;
}
add_filter(‘wp_generate_attachment_metadata’, ‘optimize_generated_image_sizes’, 10, 2);

function run_secure_command($command) {
$descriptorspec = array(
0 => array(“pipe”, “r”), // stdin
1 => array(“pipe”, “w”), // stdout
2 => array(“pipe”, “w”) // stderr
);

$process = proc_open($command, $descriptorspec, $pipes);

if (is_resource($process)) {
fclose($pipes[0]); // Schließen der stdin
$stdout = stream_get_contents($pipes[1]);
$stderr = stream_get_contents($pipes[2]);
fclose($pipes[1]);
fclose($pipes[2]);

$return_value = proc_close($process);

if ($return_value != 0) {
// Fehlerbehandlung, z. B. Loggen der Fehler oder Benachrichtigung des Administrators
error_log(“Fehler bei der Bildoptimierung: $stderr”);
}
}
}

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