Coding Standards: Pass an empty string instead of null as the `$rep…

…lacement` parameter to `_deprecated_file()`.

Follow-up to [48327].

See #50767.

git-svn-id: https://develop.svn.wordpress.org/trunk@49564 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-json.php

@@ -1,5 +1,5 @@
 <?php
-_deprecated_file( basename( __FILE__ ), '5.3.0', null, 'The PHP native JSON extension is now a requirement.' );
+_deprecated_file( basename( __FILE__ ), '5.3.0', '', 'The PHP native JSON extension is now a requirement.' );
 
 if ( ! class_exists( 'Services_JSON' ) ) :
 /* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */

src/wp-includes/registration-functions.php

@@ -6,4 +6,4 @@
  * @deprecated 2.1.0
  */
 
-_deprecated_file( basename( __FILE__ ), '2.1.0', null, __( 'This file no longer needs to be included.' ) );
+_deprecated_file( basename( __FILE__ ), '2.1.0', '', __( 'This file no longer needs to be included.' ) );

src/wp-includes/registration.php

@@ -6,4 +6,4 @@
  * @deprecated 3.1.0
  */
 
-_deprecated_file( basename( __FILE__ ), '3.1.0', null, __( 'This file no longer needs to be included.' ) );
+_deprecated_file( basename( __FILE__ ), '3.1.0', '', __( 'This file no longer needs to be included.' ) );

src/wp-includes/spl-autoload-compat.php

@@ -11,4 +11,4 @@
  * @access private
  */
 
-_deprecated_file( basename( __FILE__ ), '5.3.0', null, 'SPL can no longer be disabled as of PHP 5.3.' );
+_deprecated_file( basename( __FILE__ ), '5.3.0', '', 'SPL can no longer be disabled as of PHP 5.3.' );