sabrina-zeidan

// Preload the first image of the homepage dynamically
// In case homepage section that is displayed above the fold is modified this will preload the needed image
add_action( 'wp_head', 'sz_preload_first_image');
function sz_preload_first_image() {
    if( is_front_page() ) {
        if ( have_rows( 'home_sections' ) ) {
            while ( have_rows( 'home_sections' ) ) : the_row();
                if (get_row_layout() == 'book') {
                    $content = get_sub_field( 'field_5c70983b528e8' );

sabrina-zeidan

//From here https://gist.github.com/azizultex/dd55c5c0518a427ae3a5552f683eb29b Modified -> Mind the comment to make it work with WP > 4.7
function remove_filters_for_anonymous_class( $hook_name = '', $class_name ='', $method_name = '', $priority = 0 ) {
    global $wp_filter;
    // Take only filters on right hook name and priority
    if ( !isset($wp_filter[$hook_name][$priority]) || !is_array($wp_filter[$hook_name][$priority]) )
        return false;
    // Loop on filters registered
    foreach( (array) $wp_filter[$hook_name][$priority] as $unique_id => $filter_array ) {
        // Test if filter is an array ! (always for class/method)
        if ( isset($filter_array['function']) && is_array($filter_array['function']) ) {

sabrina-zeidan

class MyTracker {

  static $hooks;

  static function track_hooks( ) {
    $filter = current_filter();
    if ( ! empty($GLOBALS['wp_filter'][$filter]) ) {
      foreach ( $GLOBALS['wp_filter'][$filter] as $priority => $tag_hooks ) {
        foreach ( $tag_hooks as $hook ) {
          if ( is_array($hook['function']) )  {

sabrina-zeidan

function sz_defer_all_css_but( $tag, $handle ) {
	if (is_admin()) { return $tag; }
	$handlestoexclude = [];
    if ( !in_array($handle, $handlestoexclude ) ){  
		$dom = new \DOMDocument();
        $dom->loadHTML($tag);
        $csstag = $dom->getElementById($handle . '-css');
        $csstag->setAttribute('media', 'print');
        $csstag->setAttribute('onload', "this.media='all'");
        $csstag->removeAttribute('type');

sabrina-zeidan

//if not using rocket_lazyload_excluded_attributes filter, class remove-lazy should be added to WP Rocket settings in admin!
// + there is a helper plugin to do so in case we HAVE unique attribute to refer to https://github.com/wp-media/wp-rocket-helpers/blob/master/lazyload/wp-rocket-exclude-x-first-images-by-attribute/p

add_filter ('the_content', 'sz_add_class_to_first_img');
function sz_add_class_to_first_img($content){
	if (!is_admin() && !is_user_logged_in()){ //do only on frontend for not logged-in 
	if ( is_singular('post') ) { //do on single posts only
			$content = mb_convert_encoding($content, 'HTML-ENTITIES', "UTF-8"); 
			$document = new DOMDocument();
			libxml_use_internal_errors(true);

sabrina-zeidan

// Intercom plugin adds Intercom script to critical render path, sets it to be not defered
// And adds the script in WordPress in a way it doesn't leave much options to alter it in order to delay Intercom execution and prevent it to be render blocking
// Altering buffer in WP generally in not a great idea, but since we have no choice, let's make sure we are altering it in a way it doesn't break things
// If you use WP Rocket -- use 'rocket_buffer' filter instead

add_action( 'init', 'sz_buffer_process_post' ); //we use 'init' action to use ob_start()
function sz_buffer_process_post() {
    ob_start();
}

sabrina-zeidan

//For example we need to modify all <img> tags in the templates that use ACF img fields. 
//To locate them in the theme we need to know their names.
//This snippet will list the names of all ACF fields of image type used on the site, so that we'll be able to search for them in the theme files

			$field_groups = acf_get_field_groups();
			$all_fields = array();
			foreach ($field_groups as $field_group){
				$fields = acf_get_fields($field_group['key']);
				$all_fields = array_merge($all_fields, $fields);
			}		

sabrina-zeidan

class Alter_WP_Scripts extends WP_Scripts{
    //also $deps method!
    function do_item( $handle, $group = false ){       
    	if( 'handle_here' == $handle ){
    		$handle = false;
    	}
        return parent::do_item( $handle, $group );    	
    }
}
if( !is_admin() ){

sabrina-zeidan

//add_action( 'wp_print_scripts', 'sz_enqueue_scripts', 10); //run later or via wp_print_scripts ot catch all scripts
	add_action( 'wp_enqueue_scripts', 'sz_enqueue_scripts', 999); 
	function sz_enqueue_scripts(){
		global $wp_scripts;
		//change dependency to load earlier
		$handles_to_filter = array('dt-above-fold');
		$dependency_handle_to_add = 'wpb_composer_front_js';  //TODO: accept array
		foreach ($handles_to_filter as $handle_to_filter){
			foreach( $wp_scripts->registered as $script_object) { //find script in registered by handle
				if ($script_object->handle == $handle_to_filter){ 

sabrina-zeidan

<?php
/**
 * Plugin Name: SZ WP REST API Tutorial
 * Description: It's an example of WP REST API usage for search with autocomplete with vanilla JS
 * Plugin URI:  
 * Author:      Sabrina Zeidan
 * Author URI:  https://sabrinazeidan.com
 * License:     GNU General Public License v2 or later
 * License URI: http://www.gnu.org/licenses/gpl-2.0.html
 *