[WP] Load more posts using AJAX without plugins xD

wp-load-more-posts-ajax.php

<?php
function wpajax_load_more_posts(){
    $page = sanitize_key( $_POST['page'] ); // Previously saved in JS or somewhere else
    // Arguments
    $args = array(
        'category_name'     => 'Portfolio',
        'posts_per_page'    => 6,
        'paged'             => $page
    );
    // The Query
    $query = new WP_Query( $args );
    
    // The Loop
    if ( $query->have_posts() ) {
    	$response = array(
    	    'success'   => true,
    	    'message'   => 'Posts recovered with success!',
    	    'data'      => $query->posts
    	);
    } else {
    	$response = array(
    	    'success'   => false,
    	    'message'   => 'Empty posts!'
    	);
    }
    /* Restore original Post Data */
    wp_reset_postdata();
    echo json_encode( $response );
    die();
}

add_action( 'wp_ajax_load_more_posts', 'wpajax_load_more_posts' );
add_action( 'wp_ajax_nopriv_load_more_posts', 'wpajax_load_more_posts' );