Added check for zip-extension

plugins/check.php

@@ -34,6 +34,7 @@ if (!extension_loaded('mbstring'))	$error .= ('Error 301: PHP mbstring extension
 if (!extension_loaded('gd'))		$error .= ('Error 302: PHP gd extension not activated' . PHP_EOL);
 if (!extension_loaded('mysqli'))	$error .= ('Error 303: PHP mysqli extension not activated' . PHP_EOL);
 if (!extension_loaded('json'))		$error .= ('Error 304: PHP json extension not activated' . PHP_EOL);
+if (!extension_loaded('zip'))		$error .= ('Error 305: PHP zip extension not activated' . PHP_EOL);
 
 // Config
 if (!isset($dbName)||$dbName=='')	$error .= ('Error 400: No property for $dbName in config.php' . PHP_EOL);