Merge pull request #110 from Automattic/restrict-is_multi_author-usage

Adding is_multi_author function to restricted ones.

Author: david-binda

WordPressVIPMinimum/Sniffs/VIP/RestrictedFunctionsSniff.php

@@ -77,6 +77,13 @@ public function getGroups() {
 					'dbDelta',
 				),
 			),
+			'is_multi_author'          => array(
+				'type'      => 'warning',
+				'message'   => '%s can be very slow on large sites and likely not needed on many VIP sites since they tend to have more than one author.',
+				'functions' => array(
+					'is_multi_author',
+				),
+			),
 		);
 
 		$deprecated_vip_helpers = array(

WordPressVIPMinimum/Tests/VIP/RestrictedFunctionsUnitTest.inc

@@ -36,4 +36,6 @@ wp_mail(); // Bad. Warning.
 
 mail(); // Bad. Warning.
 
-dbDelta();
+dbDelta(); // Bad. Warning.
+
+is_multi_author(); // Bad. Warning.

WordPressVIPMinimum/Tests/VIP/RestrictedFunctionsUnitTest.php

@@ -45,6 +45,7 @@ public function getWarningList() {
 			33 => 1,
 			35 => 1,
 			37 => 1,
+			41 => 1,
 		);
 
 	}

ruleset_test.inc

@@ -169,5 +169,7 @@ $hello = true === isset( $_GET['utm_medium'] ) ? true : false; // NOK. Warning 3
 
 wp_safe_redirect( 'https.//vip.wordpress.com' ); // NOK. Error.
 
+is_multi_author(); // NOK. Warning.
+
 ?>
 

ruleset_test.php

@@ -50,7 +50,7 @@
 		157 => 1,
 		166 => 1,
 		170 => 1,
-		172 => 1, // Error on the end of the file. When any code is added, bounce this.
+		174 => 1, // Error on the end of the file. When any code is added, bounce this.
 	),
 	'warnings' => array(
 		9   => 1,
@@ -75,6 +75,7 @@
 		162 => 1,
 		164 => 1,
 		168 => 1,
+		172 => 1,
 	),
 	'messages' => array(
 		129 => array(