Wordpress - Send email new post

functions.php

<?php 
// add to your theme's functions.php file

// _post can be any custom post type as well. I.E. if you have a book post type it would be 'save_post_book'
add_action( 'save_post_post', function( $post_ID, $post, $update ) {
    
    // if it is an update and not a new post, return early
    if ( $update ) return;
    
    // a new post was created, send an email out
    
    // send email to this address. You could change this into an array of user emails pulled from the users of
    // your site and then loop over calling the below wp_mail for each user. Look into the get_users() function for 
    // more info: https://codex.wordpress.org/Function_Reference/get_users
    $to = 'sendto@theworld.com';
    
    // set your subject. Can include info about post, such as the post_title
    $subject = 'New Post from mysite.com - ' . get_the_title( $post_ID );
    
    // let recipient know a new post has been made and include the link to it.
    $body = 'A new post has been made on my site! Check it out at ' . get_permalink( $post_ID );
    
    // Set mail content type to text/html if necessay
    // if you want to send an HTML email (where the body content above contains html) uncomment the following
    //add_filter( 'wp_mail_content_type', function() {
    //    return 'text/html';
    //});
    
    // send the mail.
    wp_mail( $to, $subject, $body );
    
    
}, 10, 3 );