Prevent Gravity Forms entries and notifications that contain spammy words (e.g. spam)

gravity-forms-block-spam-words.php

<?php

add_action( 'gform_pre_send_email', 'keywords_check' );
/**
 * Check the message field of the entry for bad words.
 * If any are detected, silently discard the email and entry.
 *
 * @param  array 	$email        	Email data
 * @param  string 	$format       	Email format (text or HTML)
 * @param  array 	$notification 	Notificaiton data
 * @param  array 	$entry        	Entry data
 *
 * @return array
 */
function keywords_check( $email, $format, $notification, $entry ) {

	$stop_words = array(
		'outsource', 
		'Madam',
		' SEO ',
		'long term relationship',
		'free shipping',
		'lead conversion'
	);

	foreach ( $stop_words as $stop_word ) {
		if ( false !== stripos( rgar( $entry, '3' ), $stop_word ) ) {
			$email['abort_email'] = true;
			GFAPI::delete_entry( $entry['id'] );
			return $email;
		}
	}
}