Comments: add __get() and __set() to WP_Comment to provide BC for plugins that are grabbing post properties from the comment object due to an (unintended?) side effect of JOINing with the posts table in WP_Comment_Query, see [17667]. 'fields' used to default to *, so the JOIN would grab every field from both tables. #YOLO

Since [34310], these properties no longer exist. We can lazy load them for plugins with the magic methods. 

Fixes #27571.


git-svn-id: https://develop.svn.wordpress.org/trunk@34583 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-comment.php

@@ -320,4 +320,43 @@ final class WP_Comment {
 
 		return false;
 	}
+
+	/**
+	 * Whether a comment has post from which to retrieve magic properties
+	 *
+	 * @since 4.4.0
+	 * @access public
+	 *
+	 * @param string $name
+	 * @return bool
+	 */
+	public function __isset( $name ) {
+		if (
+			0 === (int) $this->comment_post_ID
+			|| property_exists( $this, $name )
+		) {
+			return;
+		}
+
+		$post = get_post( $this->comment_post_ID );
+		if ( $post ) {
+			return property_exists( $post, $name );
+		}
+	}
+
+	/**
+	 * Magic getter for $post properties
+	 *
+	 * @since 4.4.0
+	 * @access public
+	 *
+	 * @param string $name
+	 * @return mixed
+	 */
+	public function __get( $name ) {
+		$post = get_post( $this->comment_post_ID );
+		if ( $post ) {
+			return $post->$name;
+		}
+	}
 }