Add filter to required extensions and filter_var() to required functions

Author: westonruter

amp.php

@@ -64,6 +64,11 @@
 			'DOMXPath',
 		),
 	),
+	'filter' => array(
+		'functions' => array(
+			'filter_var',
+		),
+	),
 	// Required by PHP-CSS-Parser.
 	'iconv'  => array(
 		'functions' => array( 'iconv' ),

composer.json

@@ -9,6 +9,7 @@
     "ext-curl": "*",
     "ext-date": "*",
     "ext-dom": "*",
+    "ext-filter": "*",
     "ext-iconv": "*",
     "ext-json": "*",
     "ext-libxml": "*",