Using Gravity Forms ‘gform_get_form_filter’ PHP filter

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The gform_get_form_filter Gravity Forms PHP filter allows you to modify the form’s HTML after it has been generated but before it is displayed.

Usage

Applies to all forms:

add_filter('gform_get_form_filter', 'your_function_name', 10, 2);

To target a specific form, append the form ID to the hook name (format: gform_get_form_filter_FORMID):

add_filter('gform_get_form_filter_10', 'your_function_name', 10, 2);

Parameters

  • $form_string (string): The form markup, including the init scripts.
  • $form (Form Object): The form currently being processed.

More information

See Gravity Forms Docs: gform_get_form_filter

Examples

Hide form for logged-in users

Hide the form if the user is already logged in:

add_filter('gform_get_form_filter_1', function($form_string, $form) {
if (is_user_logged_in()) {
$form_string = "<p>This form is for new users, as you are already registered you don't need to use it again.</p>";
}
return $form_string;
}, 10, 2);

Hide form on a specific day of the week

Hide the form on Mondays:

add_filter('gform_get_form_filter_1', 'custom_schedule', 10, 2);
function custom_schedule($form_string, $form) {
$day = date('l');
if ($day == 'Monday') {
$form_string = '<p>We are closed today, please return tomorrow to make your booking.</p>';
}
return $form_string;
}

Remove a form class conditionally

Remove the gf_simple_horizontal class for a form with ID 63 if the page ID is not 9098:

add_filter('gform_get_form_filter_63', function($form_string, $form) {
if (!is_page(9098)) {
$form_string = str_replace('gf_simple_horizontal', '', $form_string);
}
return $form_string;
}, 10, 2);

Add custom content to form

Add custom content after the form:

add_filter('gform_get_form_filter_1', function($form_string, $form) {
$custom_content = '<p>Custom content goes here.</p>';
$form_string .= $custom_content;
return $form_string;
}, 10, 2);

Wrap form in custom container

Wrap the form in a custom <div> container:

add_filter('gform_get_form_filter_1', function($form_string, $form) {
$form_string = '<div class="custom-container">' . $form_string . '</div>';
return $form_string;
}, 10, 2);

This code should be placed in the functions.php file of your active theme.