Hook Gravity Forms confirmation and redirect the user - http://wp-doin.com

gf_confirmation_hook.php

<?php

add_filter( "gform_confirmation_3", "cc_confirmation_redirect_1_3", 3, 4 );

/**
 * Redirect the visitor on successful form submission
 * @hook gform_confirmation
 */
function cc_confirmation_redirect_1_3($confirmation, $form, $lead, $ajax) {
	
	// lets reference and sanitize the first entry field, the id corresponds to the field id from the form
	$param = esc_attr( $lead[1] );
	
	// let's construct the url get parameters
	$params = array( 'param' => $param );

	// let's get our url
	$url = 'http://example.com';
	
	// redirect the visitor
	wp_safe_redirect( add_query_arg( $params, esc_url( $url ) ) );
	exit;
}