# convertkit/3.3.6/includes/functions.php

Kit (formerly ConvertKit) – Email Newsletter, Email Marketing, Membership, Subscribers and Landing Pages, version 3.3.6. 886 lines.

- Page: https://pluginprobe.com/plugins/convertkit/3.3.6/code/includes/functions.php
- Raw: https://pluginprobe.com/plugins/convertkit/3.3.6/raw/includes/functions.php
- Modified: 2026-04-22T12:35:30+00:00

Line numbers below start at 1. Link to a line or a range by appending a fragment to the
page URL, for example `https://pluginprobe.com/plugins/convertkit/3.3.6/code/includes/functions.php#L10-L20`.

```php
<?php
/**
 * ConvertKit general plugin functions.
 *
 * @package ConvertKit
 * @author ConvertKit
 */

/**
 * Runs the activation and update routines when the plugin is activated.
 *
 * @since   1.9.7.4
 *
 * @param   bool $network_wide   Is network wide activation.
 */
function convertkit_plugin_activate( $network_wide ) {

	// Initialise Plugin.
	$convertkit = WP_ConvertKit();
	$convertkit->initialize();

	// Check if we are on a multisite install, activating network wide, or a single install.
	if ( ! is_multisite() || ! $network_wide ) {
		// Single Site activation.
		$convertkit->get_class( 'setup' )->activate();

		// Set a transient for 30 seconds to redirect to the setup screen on activation.
		set_transient( 'convertkit-setup', true, 30 );
	} else {
		// Multisite network wide activation.
		$sites = get_sites(
			array(
				'number' => 0,
			)
		);
		foreach ( $sites as $site ) {
			switch_to_blog( (int) $site->blog_id );
			$convertkit->get_class( 'setup' )->activate();
			restore_current_blog();
		}
	}

}

/**
 * Runs the activation and update routines when the plugin is activated
 * on a WordPress multisite setup.
 *
 * @since   1.9.7.4
 *
 * @param   WP_Site|int $site_or_blog_id    WP_Site or Blog ID.
 */
function convertkit_plugin_activate_new_site( $site_or_blog_id ) {

	// Check if $site_or_blog_id is a WP_Site or a blog ID.
	if ( is_a( $site_or_blog_id, 'WP_Site' ) ) {
		$site_or_blog_id = $site_or_blog_id->blog_id;
	}

	// Initialise Plugin.
	$convertkit = WP_ConvertKit();
	$convertkit->initialize();

	// Run installation routine.
	switch_to_blog( $site_or_blog_id );
	$convertkit->get_class( 'setup' )->activate();
	restore_current_blog();

}

/**
 * Runs the deactivation routine when the plugin is deactivated.
 *
 * @since   1.9.7.4
 *
 * @param   bool $network_wide   Is network wide deactivation.
 */
function convertkit_plugin_deactivate( $network_wide ) {

	// Initialise Plugin.
	$convertkit = WP_ConvertKit();
	$convertkit->initialize();

	// Check if we are on a multisite install, activating network wide, or a single install.
	if ( ! is_multisite() || ! $network_wide ) {
		// Single Site activation.
		$convertkit->get_class( 'setup' )->deactivate();
	} else {
		// Multisite network wide activation.
		$sites = get_sites(
			array(
				'number' => 0,
			)
		);
		foreach ( $sites as $site ) {
			switch_to_blog( (int) $site->blog_id );
			$convertkit->get_class( 'setup' )->deactivate();
			restore_current_blog();
		}
	}

}

/**
 * Helper method to get supported Post Types.
 *
 * @since   1.9.6
 *
 * @return  array   Post Types
 */
function convertkit_get_supported_post_types() {

	// Define supported Post Types.
	$post_types = array(
		'page',
		'post',
	);

	// If public Custom Post Types can be fetched, include them now.
	if ( function_exists( 'get_post_types' ) ) {
		// Get public Custom Post Types.
		$custom_post_types = (array) get_post_types(
			array(
				'public'   => true,

				// Don't include WordPress' built in Post Types, such as attachment, revisino and nav_menu_item.
				'_builtin' => false,
			)
		);

		$post_types = array_merge(
			$post_types,
			array_keys( $custom_post_types )
		);
	}

	/**
	 * Defines the Post Types that support ConvertKit Forms.
	 *
	 * @since   1.9.6
	 *
	 * @param   array   $post_types     Post Types
	 */
	$post_types = apply_filters( 'convertkit_get_supported_post_types', $post_types );

	return $post_types;

}

/**
 * Helper method to get supported Post Types for Restricted Content (Member's Content)
 *
 * @since   2.1.0
 *
 * @deprecated 2.4.3 No longer used by internal code and not recommended. Use `convertkit_get_supported_post_types` instead.
 *
 * @return  array   Post Types
 */
function convertkit_get_supported_restrict_content_post_types() {

	return convertkit_get_supported_post_types();

}

/**
 * Helper method to get registered Shortcodes.
 *
 * @since   1.9.6.5
 *
 * @return  array   Shortcodes
 */
function convertkit_get_shortcodes() {

	$shortcodes = array();

	/**
	 * Registers shortcodes for the ConvertKit Plugin.
	 *
	 * @since   1.9.6.5
	 *
	 * @param   array   $shortcodes     Shortcodes
	 */
	$shortcodes = apply_filters( 'convertkit_shortcodes', $shortcodes );

	return $shortcodes;

}

/**
 * Helper method to get registered Blocks.
 *
 * @since   1.9.6
 *
 * @return  array   Blocks
 */
function convertkit_get_blocks() {

	$blocks = array();

	/**
	 * Registers blocks for the ConvertKit Plugin.
	 *
	 * @since   1.9.6
	 *
	 * @param   array   $blocks     Blocks
	 */
	$blocks = apply_filters( 'convertkit_blocks', $blocks );

	return $blocks;

}

/**
 * Helper method to get registered Block formatters for Gutenberg.
 *
 * @since   2.2.0
 *
 * @return  array   Block formatters
 */
function convertkit_get_block_formatters() {

	$block_formatters = array();

	/**
	 * Registers block formatters in Gutenberg for the ConvertKit Plugin.
	 *
	 * @since   2.2.0
	 *
	 * @param   array   $block_formatters     Block formatters.
	 */
	$block_formatters = apply_filters( 'convertkit_get_block_formatters', $block_formatters );

	return $block_formatters;

}

/**
 * Helper method to get registered plugin sidebars.
 *
 * @since   3.3.0
 *
 * @return  array   Plugin sidebars
 */
function convertkit_get_plugin_sidebars() {

	$plugin_sidebars = array();

	/**
	 * Registers plugin sidebars for the WordPress block editor.
	 *
	 * @since   3.3.0
	 *
	 * @param   array   $plugin_sidebars     Plugin sidebars.
	 */
	$plugin_sidebars = apply_filters( 'convertkit_plugin_sidebars', $plugin_sidebars );

	return $plugin_sidebars;

}

/**
 * Helper method to get registered pre-publish actions.
 *
 * @since   2.4.0
 *
 * @return  array   Pre-publish actions
 */
function convertkit_get_pre_publish_actions() {

	$pre_publish_actions = array();

	/**
	 * Registers pre-publish actions for the ConvertKit Plugin.
	 *
	 * @since   2.4.0
	 *
	 * @param   array   $pre_publish_panels     Pre-publish actions.
	 */
	$pre_publish_actions = apply_filters( 'convertkit_get_pre_publish_actions', $pre_publish_actions );

	return $pre_publish_actions;

}

/**
 * Helper method to get registered importers that can replace third party
 * form shortcodes and blocks with Kit form shortcodes and blocks.
 *
 * @since   3.1.7
 *
 * @return  array   Importers.
 */
function convertkit_get_form_importers() {

	$importers = array();

	/**
	 * Registers form importers for the ConvertKit Plugin.
	 *
	 * @since   3.1.7
	 *
	 * @param   array   $importers     Importers.
	 */
	$importers = apply_filters( 'convertkit_get_form_importers', $importers );

	return $importers;

}

/**
 * Helper method to return the Plugin Settings Link
 *
 * @since   1.9.6
 *
 * @param   array $query_args     Optional Query Args.
 * @return  string                  Settings Link
 */
function convertkit_get_settings_link( $query_args = array() ) {

	$query_args = array_merge(
		$query_args,
		array(
			'page' => '_wp_convertkit_settings',
		)
	);

	return add_query_arg( $query_args, admin_url( 'options-general.php' ) );

}

/**
 * Helper method to return the Plugin Settings Link
 *
 * @since   2.2.4
 *
 * @param   array $query_args     Optional Query Args.
 * @return  string                  Settings Link
 */
function convertkit_get_setup_wizard_plugin_link( $query_args = array() ) {

	$query_args = array_merge(
		$query_args,
		array(
			'page' => 'convertkit-setup',
		)
	);

	return add_query_arg( $query_args, admin_url( 'options.php' ) );

}

/**
 * Helper method to return the URL the user needs to visit to register a ConvertKit account.
 *
 * @since   1.9.8.4
 *
 * @return  string  ConvertKit Registration URL.
 */
function convertkit_get_registration_url() {

	return add_query_arg(
		array(
			'utm_source'  => 'wordpress',
			'utm_term'    => get_locale(),
			'utm_content' => 'convertkit',
		),
		'https://app.kit.com/users/signup'
	);

}

/**
 * Helper method to return the URL the user needs to visit to sign in to their ConvertKit account.
 *
 * @since   1.9.6.1
 *
 * @return  string  ConvertKit Login URL.
 */
function convertkit_get_sign_in_url() {

	return add_query_arg(
		array(
			'utm_source'  => 'wordpress',
			'utm_term'    => get_locale(),
			'utm_content' => 'convertkit',
		),
		'https://app.kit.com/'
	);

}

/**
 * Helper method to return the URL the user needs to visit to manage thier billing.
 *
 * @since   2.2.7
 *
 * @return  string  ConvertKit Billing URL.
 */
function convertkit_get_billing_url() {

	return add_query_arg(
		array(
			'utm_source'  => 'wordpress',
			'utm_term'    => get_locale(),
			'utm_content' => 'convertkit',
		),
		'https://app.kit.com/account_settings/billing/'
	);

}

/**
 * Helper method to return the URL the user needs to visit on the ConvertKit app to create a new Form or Landing Page.
 *
 * @since   2.2.3
 *
 * @return  string              ConvertKit App URL
 */
function convertkit_get_new_form_url() {

	return add_query_arg(
		array(
			'utm_source'  => 'wordpress',
			'utm_term'    => get_locale(),
			'utm_content' => 'convertkit',
		),
		'https://app.kit.com/forms/new/'
	);

}

/**
 * Helper method to return the URL the user needs to visit to edit ConvertKit forms.
 *
 * @since   2.2.3
 *
 * @return  string  ConvertKit Form Editor URL.
 */
function convertkit_get_form_editor_url() {

	return add_query_arg(
		array(
			'utm_source'  => 'wordpress',
			'utm_term'    => get_locale(),
			'utm_content' => 'convertkit',
		),
		'https://app.kit.com/forms'
	);

}

/**
 * Helper method to return the URL the user needs to visit on the ConvertKit app to create a new Landing Page.
 *
 * @since   2.5.5
 *
 * @return  string              ConvertKit App URL
 */
function convertkit_get_new_landing_page_url() {

	return add_query_arg(
		array(
			'utm_source'  => 'wordpress',
			'utm_term'    => get_locale(),
			'utm_content' => 'convertkit',
		),
		'https://app.kit.com/pages/new/'
	);

}

/**
 * Helper method to return the URL the user needs to visit on the ConvertKit app to create a new Tag.
 *
 * @since   2.3.3
 *
 * @return  string  ConvertKit App URL.
 */
function convertkit_get_new_tag_url() {

	return add_query_arg(
		array(
			'utm_source'  => 'wordpress',
			'utm_term'    => get_locale(),
			'utm_content' => 'convertkit',
		),
		'https://app.kit.com/subscribers/'
	);

}

/**
 * Helper method to return the URL the user needs to visit on the ConvertKit app to create a new Broadcast.
 *
 * @since   2.2.6
 *
 * @return  string  ConvertKit App URL.
 */
function convertkit_get_new_broadcast_url() {

	return add_query_arg(
		array(
			'utm_source'  => 'wordpress',
			'utm_term'    => get_locale(),
			'utm_content' => 'convertkit',
		),
		'https://app.kit.com/campaigns/'
	);

}

/**
 * Helper method to return the URL the user needs to visit on the ConvertKit app to edit a draft Broadcast.
 *
 * @since   2.4.0
 *
 * @param   int $broadcast_id   ConvertKit Broadcast ID.
 * @return  string                  ConvertKit App URL.
 */
function convertkit_get_edit_broadcast_url( $broadcast_id ) {

	return add_query_arg(
		array(
			'utm_source'  => 'wordpress',
			'utm_term'    => get_locale(),
			'utm_content' => 'convertkit',
		),
		sprintf(
			'https://app.kit.com/campaigns/%s/draft',
			$broadcast_id
		)
	);

}

/**
 * Helper method to return the URL the user needs to visit on the ConvertKit app to create a new Product.
 *
 * @since   2.2.3
 *
 * @return  string  ConvertKit App URL.
 */
function convertkit_get_new_product_url() {

	return add_query_arg(
		array(
			'utm_source'  => 'wordpress',
			'utm_term'    => get_locale(),
			'utm_content' => 'convertkit',
		),
		'https://app.kit.com/products/new/'
	);

}

/**
 * Helper method to enqueue the frontend CSS file.
 *
 * @since   3.2.0
 */
function convertkit_enqueue_frontend_css() {

	wp_enqueue_style( 'convertkit-frontend', CONVERTKIT_PLUGIN_URL . 'resources/frontend/css/frontend.css', array(), CONVERTKIT_PLUGIN_VERSION );

}

/**
 * Helper method to enqueue the frontend JS file.
 *
 * @since   3.2.0
 */
function convertkit_enqueue_frontend_js() {

	wp_enqueue_script(
		'convertkit-js',
		CONVERTKIT_PLUGIN_URL . 'resources/frontend/js/dist/frontend.min.js',
		array(),
		CONVERTKIT_PLUGIN_VERSION,
		true
	);

}

/**
 * Helper method to enqueue Select2 scripts for use within the ConvertKit Plugin.
 *
 * @since   1.9.6.4
 */
function convertkit_select2_enqueue_scripts() {

	wp_enqueue_script( 'convertkit-select2', 'https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/js/select2.min.js', array( 'jquery' ), CONVERTKIT_PLUGIN_VERSION, false );
	wp_enqueue_script( 'convertkit-admin-select2', CONVERTKIT_PLUGIN_URL . 'resources/backend/js/select2.js', array( 'convertkit-select2' ), CONVERTKIT_PLUGIN_VERSION, false );

}

/**
 * Helper method to enqueue Select2 stylesheets for use within the ConvertKit Plugin.
 *
 * @since   1.9.6.4
 */
function convertkit_select2_enqueue_styles() {

	wp_enqueue_style( 'convertkit-select2', 'https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/css/select2.min.css', array(), CONVERTKIT_PLUGIN_VERSION );
	wp_enqueue_style( 'convertkit-admin-select2', CONVERTKIT_PLUGIN_URL . 'resources/backend/css/select2.css', array(), CONVERTKIT_PLUGIN_VERSION );

}

/**
 * Return the contents of the given local file.
 *
 * @since   2.2.2
 *
 * @param   string $local_file     Local file, including path.
 * @return  string                  File contents.
 */
function convertkit_get_file_contents( $local_file ) {

	// Bail if the file doesn't exist.
	if ( ! file_exists( $local_file ) ) {
		return '';
	}

	// Read file.
	$contents = file_get_contents( $local_file ); // phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents

	// Return an empty string if the contents of the file could not be read.
	if ( ! $contents ) {
		return '';
	}

	// Return file's contents.
	return $contents;

}

/**
 * Returns a dropdown field commonly used for settings, comprising of:
 * - Do not subscribe
 * - Subscribe
 * - Subscribe to Form
 *
 * @since   2.5.2
 *
 * @param   string     $name                Field name.
 * @param   string     $value               Field value.
 * @param   string     $id                  Field ID attribute.
 * @param   string     $css_class           Field CSS class(es).
 * @param   string     $context             Resource context.
 * @param   bool|array $additional_options  Additional <option> key/value pairs.
 */
function convertkit_get_subscription_dropdown_field( $name, $value, $id, $css_class = '', $context = '', $additional_options = false ) { // phpcs:ignore Generic.CodeAnalysis.UnusedFunctionParameter

	// Load resource classes.
	$forms     = new ConvertKit_Resource_Forms( $context );
	$tags      = new ConvertKit_Resource_Tags( $context );
	$sequences = new ConvertKit_Resource_Sequences( $context );

	ob_start();
	include CONVERTKIT_PLUGIN_PATH . '/views/backend/subscription-dropdown-field.php';
	$output = trim( ob_get_clean() );

	// Return output.
	return $output;

}

/**
 * Helper method to safely call get_current_screen(), returning false
 * if the function is not available or returns null.
 *
 * Otherwise returns the given WP_Screen property.
 *
 * @since   2.5.9
 *
 * @param   string $property   WP_Screen property to return.
 * @return  bool|string
 */
function convertkit_get_current_screen( $property ) {

	// Bail if we cannot determine the screen.
	if ( ! function_exists( 'get_current_screen' ) ) {
		return false;
	}

	// Get screen.
	$screen = get_current_screen();

	// Bail if the screen couldn't be determined.
	if ( is_null( $screen ) ) {
		return false;
	}

	// Return property.
	return $screen->$property;

}

/**
 * Outputs the Intercom help widget script.
 *
 * @since   2.7.2
 */
function convertkit_output_intercom_messenger() {

	?>
	<script>
		const KIT_INTERCOM_APP_ID = 'e4n3xtxz';
		window.intercomSettings = {
		api_base: 'https://api-iam.intercom.io',
		app_id: KIT_INTERCOM_APP_ID
		};
	</script>

	<script>
	(function(){var w=window;var ic=w.Intercom;if(typeof ic==="function"){ic('update',w.intercomSettings);}else{var d=document;var i=function(){i.c(arguments);};i.q=[];i.c=function(args){i.q.push(args);};w.Intercom=i;var l=function(){var s=d.createElement('script');s.type='text/javascript';s.async=true;s.src='https://widget.intercom.io/widget/' + KIT_INTERCOM_APP_ID;var x=d.getElementsByTagName('script')[0];x.parentNode.insertBefore(s, x);};if(document.readyState==='complete'){l();}else if(w.attachEvent){w.attachEvent('onload',l);}else{w.addEventListener('load',l,false);}}})();
	</script>
	<?php

}

/**
 * Checks if the given Theme is active.
 *
 * @since  3.1.4
 *
 * @param   string $theme_name   Theme name.
 * @return  bool
 */
function convertkit_is_theme_active( $theme_name ) {

	// Assume Theme isn't active if we can't detect it.
	if ( ! function_exists( 'wp_get_theme' ) ) {
		return false;
	}

	// Check the Parent Theme if we're on a Child Theme.
	if ( wp_get_theme()->parent() ) {
		$theme = wp_get_theme()->parent();
	} else {
		$theme = wp_get_theme();
	}

	return strtolower( $theme->get( 'Name' ) ) === strtolower( $theme_name );

}

/**
 * Returns permitted HTML output when using wp_kses( ..., convertkit_kses_allowed_html()).
 *
 * @since   2.8.5
 */
function convertkit_kses_allowed_html() {

	// Get WordPress' permitted HTML elements.
	$elements = wp_kses_allowed_html( 'post' );

	// Add form elements.
	$form_elements = array(
		'input'    => array(
			'type'    => true,
			'id'      => true,
			'name'    => true,
			'class'   => true,
			'value'   => true,
			'checked' => true,
			'min'     => true,
			'max'     => true,
			'step'    => true,
			'data-*'  => true,
		),
		'select'   => array(
			'id'       => true,
			'name'     => true,
			'class'    => true,
			'size'     => true,
			'multiple' => true,
			'data-*'   => true,
		),
		'option'   => array(
			'value'    => true,
			'selected' => true,
			'data-*'   => true,
		),
		'optgroup' => array(
			'label'  => true,
			'data-*' => true,
		),
		'label'    => array(
			'for' => true,
		),
	);

	return array_merge( $elements, $form_elements );

}

/**
 * Saves the new access token, refresh token and its expiry, and schedules
 * a WordPress Cron event to refresh the token on expiry.
 *
 * @since   3.1.1
 *
 * @param   array  $result      New Access Token, Refresh Token and Expiry.
 * @param   string $client_id   OAuth Client ID used for the Access and Refresh Tokens.
 */
function convertkit_maybe_update_credentials( $result, $client_id ) {

	// Don't save these credentials if they're not for this Client ID.
	// They're for another Kit Plugin that uses OAuth.
	if ( $client_id !== CONVERTKIT_OAUTH_CLIENT_ID ) {
		return;
	}

	$settings = new ConvertKit_Settings();
	$settings->update_credentials( $result );

}

/**
 * Deletes the stored access token, refresh token and its expiry from the Plugin settings,
 * and clears any existing scheduled WordPress Cron event to refresh the token on expiry,
 * when the user revokes the access token.
 *
 * @since   3.2.4
 *
 * @param   string $client_id   OAuth Client ID used for the Access and Refresh Tokens.
 */
function convertkit_delete_credentials( $client_id ) {

	// Don't delete these credentials if they're not for this Client ID.
	// They're for another Kit Plugin that uses OAuth.
	if ( $client_id !== CONVERTKIT_OAUTH_CLIENT_ID ) {
		return;
	}

	// Delete Access and Refresh Tokens.
	$settings = new ConvertKit_Settings();
	$settings->delete_credentials();

}

/**
 * Deletes the stored access token, refresh token and its expiry from the Plugin settings,
 * and clears any existing scheduled WordPress Cron event to refresh the token on expiry,
 * when either:
 * - The access token is invalid
 * - The access token expired, and refreshing failed
 *
 * @since   3.1.1
 *
 * @param   WP_Error $result      Error result.
 * @param   string   $client_id   OAuth Client ID used for the Access and Refresh Tokens.
 */
function convertkit_maybe_delete_credentials( $result, $client_id ) {

	// Don't save these credentials if they're not for this Client ID.
	// They're for another Kit Plugin that uses OAuth.
	if ( $client_id !== CONVERTKIT_OAUTH_CLIENT_ID ) {
		return;
	}

	// If the error isn't a 401, don't delete credentials.
	// This could be e.g. a temporary network error, rate limit or similar.
	if ( $result->get_error_data( 'convertkit_api_error' ) !== 401 ) {
		return;
	}

	// Persist an error notice in the WordPress Administration until the user fixes the problem.
	WP_ConvertKit()->get_class( 'admin_notices' )->add( 'authorization_failed' );

	$settings = new ConvertKit_Settings();
	$settings->delete_credentials();

}

// Update Access Token when refreshed by the API class.
add_action( 'convertkit_api_get_access_token', 'convertkit_maybe_update_credentials', 10, 2 );
add_action( 'convertkit_api_refresh_token', 'convertkit_maybe_update_credentials', 10, 2 );

// Delete credentials when the user revokes the access and refresh tokens.
add_action( 'convertkit_api_revoke_tokens', 'convertkit_delete_credentials', 10, 1 );

// Delete credentials if the API class uses a invalid access token.
// This prevents the Plugin making repetitive API requests that will 401.
add_action( 'convertkit_api_access_token_invalid', 'convertkit_maybe_delete_credentials', 10, 2 );

```