Administration: Introduce admin_print_footer_scripts-$hook_suffix", a dynamic version of the admin_print_footer_scripts hook.

This is now more consistent with the generic `admin_print_scripts` and the dynamic `admin_print_scripts-$hook_suffix` hooks fired in `wp-admin/admin-header.php`.

Props tfrommen.
Fixes #34334.

git-svn-id: https://develop.svn.wordpress.org/trunk@37279 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/admin-footer.php

@@ -9,6 +9,11 @@
 // don't load directly
 if ( !defined('ABSPATH') )
 	die('-1');
+
+/**
+ * @global string $hook_suffix
+ */
+global $hook_suffix;
 ?>
 
 <div class="clear"></div></div><!-- wpbody-content -->
@@ -66,6 +71,19 @@ if ( !defined('ABSPATH') )
  */
 do_action( 'admin_footer', '' );
 
+/**
+ * Prints scripts and data queued for the footer.
+ *
+ * The dynamic portion of the hook name, `$hook_suffix`,
+ * refers to the global hook suffix of the current page.
+ *
+ * @since 4.6.0
+ *
+ * @global string $hook_suffix
+ * @param string $hook_suffix The current admin page.
+ */
+do_action( "admin_print_footer_scripts-$hook_suffix" );
+
 /**
  * Prints any scripts and data queued for the footer.
  *
@@ -76,7 +94,7 @@ do_action( 'admin_print_footer_scripts' );
 /**
  * Print scripts or data after the default footer scripts.
  *
- * The dynamic portion of the hook name, `$GLOBALS['hook_suffix']`,
+ * The dynamic portion of the hook name, `$hook_suffix`,
  * refers to the global hook suffix of the current page.
  *
  * @since 2.8.0
@@ -84,7 +102,7 @@ do_action( 'admin_print_footer_scripts' );
  * @global string $hook_suffix
  * @param string $hook_suffix The current admin page.
  */
-do_action( "admin_footer-" . $GLOBALS['hook_suffix'] );
+do_action( "admin_footer-$hook_suffix" );
 
 // get_site_option() won't exist when auto upgrading from <= 2.7
 if ( function_exists('get_site_option') ) {

src/wp-admin/includes/class-wp-press-this.php

@@ -1530,6 +1530,9 @@ class WP_Press_This {
 	/** This action is documented in wp-admin/admin-footer.php */
 	do_action( 'admin_footer' );
 
+	/** This action is documented in wp-admin/admin-footer.php */
+	do_action( 'admin_print_footer_scripts-press-this.php' );
+
 	/** This action is documented in wp-admin/admin-footer.php */
 	do_action( 'admin_print_footer_scripts' );
 

src/wp-admin/includes/template.php

@@ -1651,11 +1651,19 @@ function iframe_footer() {
 	 * but run the hooks anyway since they output JavaScript
 	 * or other needed content.
 	 */
-	 ?>
+
+	/**
+	 * @global string $hook_suffix
+	 */
+	global $hook_suffix;
+	?>
 	<div class="hidden">
 <?php
 	/** This action is documented in wp-admin/admin-footer.php */
-	do_action( 'admin_footer', '' );
+	do_action( 'admin_footer', $hook_suffix );
+
+	/** This action is documented in wp-admin/admin-footer.php */
+	do_action( "admin_print_footer_scripts-$hook_suffix" );
 
 	/** This action is documented in wp-admin/admin-footer.php */
 	do_action( 'admin_print_footer_scripts' );

src/wp-includes/class-wp-customize-widgets.php

@@ -799,6 +799,9 @@ final class WP_Customize_Widgets {
 	 * @access public
 	 */
 	public function print_footer_scripts() {
+		/** This action is documented in wp-admin/admin-footer.php */
+		do_action( 'admin_print_footer_scripts-widgets.php' );
+
 		/** This action is documented in wp-admin/admin-footer.php */
 		do_action( 'admin_print_footer_scripts' );