Admin notice on wp_insert_post

Question

I am trying to display some error messages in case some conditions are not met when using wp_insert_post. However, it the admin_notice doesn't seem to trigger.

Here's the example I have:

    add_action( 'wp_insert_post', 'automate_intercom', 10, 3);
    function automate_intercom($post_id, $post, $update) {

        if($post->post_status == 'publish' && $post->post_type == 'help-center') {
            
            $someCondition = '';

            if($someCondition!== '') {

            }else{
                add_action( 'admin_notices', 'show_example_error' );


            }


        }
    }

    function show_example_error() {
        $class = 'notice notice-info';
        $message = __( 'Example error', 'admin_notice' );
        error_log("In admin notice ");
    printf( '<div class="%1$s"><p>%2$s</p></div>', esc_attr( $class ), $message); 
    }

Any ideas why it doesn't trigger the admin_notices?

Answer 1

Hooks cannot be added directly inside functions. Using do_action, you can invoke a custom hook.

In your case try out the below solution:

add_action( 'wp_insert_post', 'automate_intercom', 10, 3 );
function automate_intercom( $post_id, $post, $update ) {

    if ( $post->post_status == 'publish' && $post->post_type == 'help-center' ) {

        $someCondition = '';

        if ( $someCondition !== '' ) {

        } else {
            show_example_error();
        }
    }
}

function show_example_error() {
    $screen = get_current_screen();
    if ( $screen->post_type == 'help-center' ) {
        $class   = 'notice notice-info';
        $message = __( 'Example error', 'admin_notice' );
        error_log( 'In admin notice ' );
        printf( '<div class="%1$s"><p>%2$s</p></div>', esc_attr( $class ), $message );
    }
}
add_action( 'admin_notices', 'show_example_error' );