Upgrade/Install: Check theme compatibility during bulk upgrades.

Previously, bulk upgrades did not verify that a theme package was compatible with the site's WordPress version or the server's PHP version.

This was previusly done for plugins in #59198, but themes were missed.

Follow-up to: [56525].

Props salcode, lakshmananphp.
Fixes #59758.


git-svn-id: https://develop.svn.wordpress.org/trunk@57252 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/class-theme-upgrader.php

@@ -371,6 +371,8 @@ public function upgrade( $theme, $args = array() ) {
 	 * @since 3.0.0
 	 * @since 3.7.0 The `$args` parameter was added, making clearing the update cache optional.
 	 *
+	 * @global string $wp_version The WordPress version string.
+	 *
 	 * @param string[] $themes Array of the theme slugs.
 	 * @param array    $args {
 	 *     Optional. Other arguments for upgrading several themes at once. Default empty array.
@@ -381,6 +383,8 @@ public function upgrade( $theme, $args = array() ) {
 	 * @return array[]|false An array of results, or false if unable to connect to the filesystem.
 	 */
 	public function bulk_upgrade( $themes, $args = array() ) {
+		global $wp_version;
+
 		$defaults    = array(
 			'clear_update_cache' => true,
 		);
@@ -442,23 +446,55 @@ public function bulk_upgrade( $themes, $args = array() ) {
 			// Get the URL to the zip file.
 			$r = $current->response[ $theme ];
 
-			$result = $this->run(
-				array(
-					'package'           => $r['package'],
-					'destination'       => get_theme_root( $theme ),
-					'clear_destination' => true,
-					'clear_working'     => true,
-					'is_multi'          => true,
-					'hook_extra'        => array(
-						'theme'       => $theme,
-						'temp_backup' => array(
-							'slug' => $theme,
-							'src'  => get_theme_root( $theme ),
-							'dir'  => 'themes',
+			if ( isset( $r['requires'] ) && ! is_wp_version_compatible( $r['requires'] ) ) {
+				$result = new WP_Error(
+					'incompatible_wp_required_version',
+					sprintf(
+						/* translators: 1: Current WordPress version, 2: WordPress version required by the new theme version. */
+						__( 'Your WordPress version is %1$s, however the new theme version requires %2$s.' ),
+						$wp_version,
+						$r['requires']
+					)
+				);
+
+				$this->skin->before( $result );
+				$this->skin->error( $result );
+				$this->skin->after();
+			} elseif ( isset( $r['requires_php'] ) && ! is_php_version_compatible( $r['requires_php'] ) ) {
+				$result = new WP_Error(
+					'incompatible_php_required_version',
+					sprintf(
+						/* translators: 1: Current PHP version, 2: PHP version required by the new theme version. */
+						__( 'The PHP version on your server is %1$s, however the new theme version requires %2$s.' ),
+						PHP_VERSION,
+						$r['requires_php']
+					)
+				);
+
+				$this->skin->before( $result );
+				$this->skin->error( $result );
+				$this->skin->after();
+			} else {
+				add_filter( 'upgrader_source_selection', array( $this, 'check_package' ) );
+				$result = $this->run(
+					array(
+						'package'           => $r['package'],
+						'destination'       => get_theme_root( $theme ),
+						'clear_destination' => true,
+						'clear_working'     => true,
+						'is_multi'          => true,
+						'hook_extra'        => array(
+							'theme'       => $theme,
+							'temp_backup' => array(
+								'slug' => $theme,
+								'src'  => get_theme_root( $theme ),
+								'dir'  => 'themes',
+							),
 						),
-					),
-				)
-			);
+					)
+				);
+				remove_filter( 'upgrader_source_selection', array( $this, 'check_package' ) );
+			}
 
 			$results[ $theme ] = $result;