diff --git a/src/wp-admin/includes/class-pclzip.php b/src/wp-admin/includes/class-pclzip.php
index ae0af7a8f1..aaaeef5804 100644
--- a/src/wp-admin/includes/class-pclzip.php
+++ b/src/wp-admin/includes/class-pclzip.php
@@ -5326,6 +5326,10 @@
   {
     $v_result=1;
 
+	// EDIT for WordPress 5.3.0
+	// magic_quote functions are deprecated in PHP 7.4, now assuming it's always off.
+	/*
+
     // ----- Look if function exists
     if (   (!function_exists("get_magic_quotes_runtime"))
 	    || (!function_exists("set_magic_quotes_runtime"))) {
@@ -5344,6 +5348,7 @@
 	if ($this->magic_quotes_status == 1) {
 	  @set_magic_quotes_runtime(0);
 	}
+	*/
 
     // ----- Return
     return $v_result;
@@ -5360,6 +5365,10 @@
   {
     $v_result=1;
 
+	// EDIT for WordPress 5.3.0
+	// magic_quote functions are deprecated in PHP 7.4, now assuming it's always off.
+	/*
+
     // ----- Look if function exists
     if (   (!function_exists("get_magic_quotes_runtime"))
 	    || (!function_exists("set_magic_quotes_runtime"))) {
@@ -5376,6 +5385,7 @@
   	  @set_magic_quotes_runtime($this->magic_quotes_status);
 	}
 
+	*/
     // ----- Return
     return $v_result;
   }
diff --git a/src/wp-includes/formatting.php b/src/wp-includes/formatting.php
index fd9fca04f0..d953b8796b 100644
--- a/src/wp-includes/formatting.php
+++ b/src/wp-includes/formatting.php
@@ -2713,10 +2713,6 @@ function untrailingslashit( $string ) {
  * @return string Returns a string escaped with slashes.
  */
 function addslashes_gpc( $gpc ) {
-	if ( get_magic_quotes_gpc() ) {
-		$gpc = stripslashes( $gpc );
-	}
-
 	return wp_slash( $gpc );
 }
 
@@ -4782,8 +4778,6 @@ function map_deep( $value, $callback ) {
 /**
  * Parses a string into variables to be stored in an array.
  *
- * Uses {@link https://secure.php.net/parse_str parse_str()} and stripslashes if
- * {@link https://secure.php.net/magic_quotes magic_quotes_gpc} is on.
  *
  * @since 2.2.1
  *
@@ -4792,9 +4786,7 @@ function map_deep( $value, $callback ) {
  */
 function wp_parse_str( $string, &$array ) {
 	parse_str( $string, $array );
-	if ( get_magic_quotes_gpc() ) {
-		$array = stripslashes_deep( $array );
-	}
+
 	/**
 	 * Filters the array of variables derived from a parsed string.
 	 *
diff --git a/src/wp-includes/load.php b/src/wp-includes/load.php
index 2c63c6b277..be56883040 100644
--- a/src/wp-includes/load.php
+++ b/src/wp-includes/load.php
@@ -925,13 +925,6 @@ function wp_set_internal_encoding() {
  * @access private
  */
 function wp_magic_quotes() {
-	// If already slashed, strip.
-	if ( get_magic_quotes_gpc() ) {
-		$_GET    = stripslashes_deep( $_GET );
-		$_POST   = stripslashes_deep( $_POST );
-		$_COOKIE = stripslashes_deep( $_COOKIE );
-	}
-
 	// Escape with wpdb.
 	$_GET    = add_magic_quotes( $_GET );
 	$_POST   = add_magic_quotes( $_POST );
diff --git a/src/wp-includes/rest-api/class-wp-rest-request.php b/src/wp-includes/rest-api/class-wp-rest-request.php
index ab281179eb..7b2a32e618 100644
--- a/src/wp-includes/rest-api/class-wp-rest-request.php
+++ b/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.