GENERAL: Remove magic quote functions

The path to magic quote sanity took a fun and exciting turn: PHP core removed it and WordPress updated the minimum version.

For the formally external pclzip, the code is commented out to make investigating easier and in case we ever need to merge upstream (if that still exists) changes.

Props ayeshrajans, jrf, jorbin.
See #47783.
Fixes #18322.


git-svn-id: https://develop.svn.wordpress.org/trunk@46105 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/rest-api/class-wp-rest-request.php

@@ -689,15 +689,6 @@ class WP_REST_Request implements ArrayAccess {
 
 		parse_str( $this->get_body(), $params );
 
-		/*
-		 * Amazingly, parse_str follows magic quote rules. Sigh.
-		 *
-		 * NOTE: Do not refactor to use `wp_unslash`.
-		 */
-		if ( get_magic_quotes_gpc() ) {
-			$params = stripslashes_deep( $params );
-		}
-
 		/*
 		 * Add to the POST parameters stored internally. If a user has already
 		 * set these manually (via `set_body_params`), don't override them.