Backend ajax functionality in wordpress

wp-ajax-request.php

<?php

  function request_post(){

    $nonce = $_POST['nonce'];
    
    // check to see if the submitted nonce matches with the
    // generated nonce we created earlier
    if ( ! wp_verify_nonce( $nonce, 'my-nonce' ) )
        die ( 'Please dont');
    
    // If you need to pass in extra information
    $query_param = $_POST['query_param'];
    
    // args
    $args = array(
    	'posts_per_page' => 6,
    	'post_type' => 'post',
    );
    
    $the_query = new WP_Query( $args );
    $return_pages = array();
    
    foreach ( $the_query->posts as $page ) {
    
    	$id = $page->ID;
    
    	$return_pages[] = array(
    		'url' => get_permalink( $id ),
    		'title' => get_the_title( $id ),
      	'content' => substr( strip_tags( $page->post_content ), 0, 64 )
    	);
    
    }
    
    // Reset wordpress loop
    wp_reset_query();
    
    header( "Content-Type: application/json" );
    echo json_encode( $return_pages );
    
    exit();
  
  }
  
  // Defines the connection between the ajax request and the wordpress backend function
  add_action("wp_ajax_request-post", "request_post");
  
  // This is for users who are not logged in
  add_action("wp_ajax_nopriv_request-post", "request_post");

?>