CDN statically

simple-regex-cedeen.php

<?php
/** 
 * Taruh di functions.php paling bawah
 */
/**
 * Mengubah Semua URL image di konten menjadi berCDN
 */
function cdn_on_the_fly($content) {
    $pattern = '#(\-(\d+)x(\d+))?\.((?:jpg|gif|png|webp|jpeg))#';
    return preg_replace($pattern, '.$4?format=webp&quality=80&w=$2&h=$3', $content);
}

function replace_all_image_in_content($content) {
    $pattern = "#https:\/\/((.*)\.(?:jpg|gif|png|webp|jpeg))#";
	  
    $content = preg_replace($pattern, '//cdn.statically.io/img/${1}', $content);
    return $content;
}
add_filter('the_content', 'replace_all_image_in_content' );

/**
 * Mengubah URL image di thumbnail menjadi berCDN
 */
function replace_image_in_thumbnail($image) {
    $cdn_image = '//cdn.statically.io/img/';

    if ( $image[3] ) {
        $image_size = sprintf('-%dx%d', $image[1], $image[2]);
        $trim_url  = str_replace( $image_size, '', $image[0] );
    } else {
        $trim_url  = $image[0];
    }

    $image[0] = str_replace(['http://', 'https://'], $cdn_image, $trim_url . '?format=webp&w='. $image[1] .'&h='. $image[2] .'&quality=80' );
    return $image;
}
add_filter('wp_get_attachment_image_src', 'replace_image_in_thumbnail');