Plugins and Themes: Add filters to validation functions.

It is now possible to add additional validation requirements for themes and plugins besides the built in core checks.

Developed in WordPress/wordpress-develop#1812 and WordPress/wordpress-develop#10361.

Props kraftbj, mukesh27, jorbin, joedolson.
Fixes #54381.

Built from https://develop.svn.wordpress.org/trunk@60995


git-svn-id: http://core.svn.wordpress.org/trunk@60331 1a063a9b-81f0-0310-95a4-ce76da25c4cd

Author: aaronjorbin

wp-admin/includes/plugin.php

@@ -1247,7 +1247,20 @@ function validate_plugin_requirements( $plugin ) {
 		);
 	}
 
-	return true;
+	/**
+	 * Filters the plugin requirement validation response.
+	 *
+	 * If a plugin fails due to a Core-provided validation (incompatible WP, PHP versions), this
+	 * filter will not fire. A WP_Error response will already be returned.
+	 *
+	 * This filter is intended to add additional validation steps by site administrators.
+	 *
+	 * @since 6.9.0
+	 *
+	 * @param bool|WP_Error $met_requirements True if the plugin meets requirements, WP_Error if not.
+	 * @param string $plugin Path to the plugin file relative to the plugins directory.
+	 */
+	return apply_filters( 'validate_plugin_requirements', true, $plugin );
 }
 
 /**

wp-includes/theme.php

@@ -1002,7 +1002,20 @@ function validate_theme_requirements( $stylesheet ) {
 		);
 	}
 
-	return true;
+	/**
+	 * Filters the theme requirement validation response.
+	 *
+	 * If a theme fails due to a Core-provided validation (incompatible WP, PHP versions), this
+	 * filter will not fire. A WP_Error response will already be returned.
+	 *
+	 * This filter is intended to add additional validation steps by site administrators.
+	 *
+	 * @since 6.9.0
+	 *
+	 * @param bool|WP_Error $met_requirements True if the theme meets requirements, WP_Error if not.
+	 * @param string $stylesheet Directory name for the theme.
+	 */
+	return apply_filters( 'validate_theme_requirements', true, $stylesheet );
 }
 
 /**

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.9-alpha-60994';
+$wp_version = '6.9-alpha-60995';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.