Coding Standards: Extract extract() from the codebase.

Of the last four instances of `extract()` occurring, three of them are removed by this commit, and the fourth is appropriately documented.

See #45934.



git-svn-id: https://develop.svn.wordpress.org/trunk@44569 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-content/themes/twentyeleven/inc/widgets.php

@@ -68,7 +68,6 @@ class Twenty_Eleven_Ephemera_Widget extends WP_Widget {
 		}
 
 		ob_start();
-		extract( $args, EXTR_SKIP );
 
 		/** This filter is documented in wp-includes/default-widgets.php */
 		$args['title'] = apply_filters( 'widget_title', empty( $instance['title'] ) ? __( 'Ephemera', 'twentyeleven' ) : $instance['title'], $instance, $this->id_base );

src/wp-includes/template.php

@@ -684,6 +684,15 @@ function load_template( $_template_file, $require_once = true ) {
 	global $posts, $post, $wp_did_header, $wp_query, $wp_rewrite, $wpdb, $wp_version, $wp, $id, $comment, $user_ID;
 
 	if ( is_array( $wp_query->query_vars ) ) {
+		/*
+		 * This use of extract() cannot be removed. There are many possible ways that
+		 * templates could depend on variables that it creates existing, and no way to
+		 * detect and deprecate it.
+		 *
+		 * Passing the EXTR_SKIP flag is the safest option, ensuring globals and
+		 * function variables cannot be overwritten.
+		 */
+		// phpcs:ignore WordPress.PHP.DontExtract.extract_extract
 		extract( $wp_query->query_vars, EXTR_SKIP );
 	}
 

tests/phpunit/tests/post/output.php

@@ -29,15 +29,14 @@ class Tests_Post_Output extends WP_UnitTestCase {
 	}
 
 	function _shortcode_paragraph( $atts, $content ) {
-		extract(
-			shortcode_atts(
-				array(
-					'class' => 'graf',
-				),
-				$atts
-			)
+		$processed_atts = shortcode_atts(
+			array(
+				'class' => 'graf',
+			),
+			$atts
 		);
-		return "<p class='$class'>$content</p>\n";
+
+		return "<p class='{$processed_atts['class']}'>$content</p>\n";
 	}
 
 	function test_the_content() {

tests/phpunit/tests/shortcode.php

@@ -43,18 +43,16 @@ class Tests_Shortcode extends WP_UnitTestCase {
 
 	// [bartag foo="bar"]
 	function _shortcode_bartag( $atts ) {
-		extract(
-			shortcode_atts(
-				array(
-					'foo' => 'no foo',
-					'baz' => 'default baz',
-				),
-				$atts,
-				'bartag'
-			)
+		$processed_atts = shortcode_atts(
+			array(
+				'foo' => 'no foo',
+				'baz' => 'default baz',
+			),
+			$atts,
+			'bartag'
 		);
 
-		return "foo = {$foo}";
+		return "foo = {$processed_atts['foo']}";
 	}
 
 	// [baztag]content[/baztag]