Code Modernization: Use explicit visibility for class property declarations.

Using `var` or only `static` to declare a class property is PHP 4 code.

This updates the codebase to use explicit visibility modifiers introduced in PHP 5.

Props jrf.
Fixes #51557. See #22234.

git-svn-id: https://develop.svn.wordpress.org/trunk@49184 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/pomo/streams.php

@@ -11,8 +11,8 @@
 if ( ! class_exists( 'POMO_Reader', false ) ) :
 	class POMO_Reader {
 
-		var $endian = 'little';
-		var $_post  = '';
+		public $endian = 'little';
+		public $_post  = '';
 
 		/**
 		 * PHP5 constructor.
@@ -226,7 +226,7 @@ if ( ! class_exists( 'POMO_StringReader', false ) ) :
 	 */
 	class POMO_StringReader extends POMO_Reader {
 
-		var $_str = '';
+		public $_str = '';
 
 		/**
 		 * PHP5 constructor.