omartdev

// get thumbanil url
function get_thumbanil_url($post,$image_size){

	if ( has_post_thumbnail($post->ID) ) { 
        $thumbnail_url = wp_get_attachment_image_src(get_post_thumbnail_id($post->ID),$image_size, true );
        $thumb_url = $thumbnail_url[0];
     }
     else{
        $thumb_url = '';
     }

omartdev

// load more post  function.php
add_action('wp_ajax_load_posts_by_ajax', 'load_posts_by_ajax_callback');
add_action('wp_ajax_nopriv_load_posts_by_ajax', 'load_posts_by_ajax_callback');

function load_posts_by_ajax_callback() {
	check_ajax_referer('load_more_posts', 'security');
	$paged = $_POST['page'];	
	$newsletter_lists = get_posts(array('post_type'=>'newsletter','posts_per_page' => 8,'paged' => $paged,)); 
		 	if ( $newsletter_lists ) {

omartdev

PHP Coding Standards
----------------------
Single and Double Quotes 

echo '<a href="/static/link" title="Yeah yeah!">Link name</a>'; // if all are static
echo "<a href='$link' title='$linktitle'>$linkname</a>"; if mix of variable and string

---------------------
give [tab]   when write any variable
------------

omartdev

<?php
//add new custom control type switch
if(class_exists( 'WP_Customize_control')):
    class Doctorial_WP_Customize_Switch_Control extends WP_Customize_Control {
        public $type = 'switch';
        public function render_content() {
            ?>
            <label>
                <span class="customize-control-title"><?php echo esc_html( $this->label ); ?></span>
                <span class="description customize-control-description"><?php echo esc_html( $this->description ); ?></span>