Accessing Webform 4 Submitted data
As Oswald mentioned, you have to implement some hooks in your custom module to redirect your form submission. Here is a quick example (assume your form_id is 'webform_client_form_1'):




// hook_form_alter()
function customform_form_alter(&amp;$form, &amp;$form_state, $form_id) {

if ($form_id == 'webform_client_form_1') {
    // Add form_submit() handler
    $form['#submit'][] = 'customform_webform_submit';
}

}

// form_submit()
function customform_webform_submit($form, &amp;$form_state) {

// Submited values are in $form_state['values']['submitted_tree']
$field_values = customform_webform_values( $form_state['values']['submitted_tree']    );

// Build URL Query
$query = '';

foreach ($field_values as $value) {
    $query .= $value . '&amp;';
}

$redirect = array ( 
                'myphpapplication',
                array (
                    'query' =&gt; array ( 
                        'query' =&gt; rtrim( $query, "&amp;" )  // Get 'query' values with $_GET['query']
                    ) 
                ) 
            );

$form_state['redirect'] = $redirect;

}

// Recurse through webfrom submited values
function customform_webform_values($component) {

static $webform;

foreach($component as $key =&gt; $value) {
    if (is_array($value)) {
        customform_webform_values($value);
    }
    else {
        $webform[$key] = $value;
    }
}

return $webform;
}