Trying to stop page from resubmitting form on refresh - forms

Question

I have the following code. I am trying to prevent my page from resubmitting a form after a page refresh with the header("location:location.php"); However I get a error Listed below
Error
Warning: Cannot modify header information - headers already sent by (output started at /Users/anderskitson/Sites/fiftyfity/wp-content/themes/fiftyfityNew/contact-form copy.php:7) in /Users/anderskitson/Sites/fiftyfity/wp-content/themes/fiftyfityNew/contact-form copy.php on line 68
Code
<?php
/*
Template Name: form-test.php
*/
?>
<?php include_once( ABSPATH . 'wp-admin/includes/plugin.php' ); ?>
<? include_once(ABSPATH. 'wp-content/themes/fiftyfityNew/contact-form.php'); ?>
<?php
/**
* The template for displaying all pages.
*
* This is the template that displays all pages by default.
* Please note that this is the wordpress construct of pages
* and that other 'pages' on your wordpress site will use a
* different template.
*
* #package WordPress
* #subpackage Starkers
* #since Starkers 3.0
*/
get_header(); ?>
<script>
var i=0;
function test(){
for(i=0;i<=5;i++){
document.write( "the number is" + i);
}
}
</script>
<script>
test();
</script>
<?php function make_user_feedback_form() {
global $wpdb;
global $current_user;
$ufUserID = $current_user->ID;
if ( 'POST' == $_SERVER['REQUEST_METHOD'] && !empty( $_POST['action'] ) && $_POST['action'] == 'updateFeedback' ) {
$ufDataUpdate = $wpdb->insert( 'wp_user_feedback', array( 'date' => current_time('mysql'), 'responses' => $_POST["test"]) );
}
}?>
<div id="form">
<ol>
<form method="post">
<li><label for="test">Pick a date Babe:</label><input type="text" id="datepicker" name="test" value="" /></li> <!-- the (name="test") value is what the ('responses' => $_POST["test"]) value is talking too -->
<li><input name="submit" type="submit" id="submit" class="submit button" value="Send feedback" /></li>
<?php wp_nonce_field( 'updateFeedback' ); ?>
<input name="action" type="hidden" id="action" value="updateFeedback" />
</form>
</ol>
</div>
<?php
add_action('the_content','make_user_feedback_form');
header("location: http://localhost:8888/fiftyfity/?page_id=90");
?>
<?php
make_user_feedback_form();
?>
<?php get_sidebar(); ?>
<?php get_footer(); ?>

Answer 1

The problem is that one of the scripts you are including sends headers before WordPress gets a chance to do so, or that the blank lines between your include_once and the get_header statement makes the web server itself send its default headers.
So, modify the first few lines to look like (i.e. removing the extra PHP opening/closing tags):
<?php
/*
Template Name: form-test.php
*/
include_once( ABSPATH . 'wp-admin/includes/plugin.php' );
include_once(ABSPATH. 'wp-content/themes/fiftyfityNew/contact-form.php');
/**
* The template for displaying all pages.
*
* This is the template that displays all pages by default.
* Please note that this is the wordpress construct of pages
* and that other 'pages' on your wordpress site will use a
* different template.
*
* #package WordPress
* #subpackage Starkers
* #since Starkers 3.0
*/
get_header(); ?>
Also check the included files for any data output, header() calls or similar adjacent opening/closing tags.