Updated required php version check

plugins/check/index.php

@@ -26,7 +26,7 @@ echo('Diagnostics' . PHP_EOL);
 echo('-----------' . PHP_EOL);
 
 # PHP Version
-if (floatval(phpversion())<5.2)		$error .= ('Error: Upgrade to PHP 5.2 or higher!' . PHP_EOL);
+if (floatval(phpversion())<5.3)		$error .= ('Error: Upgrade to PHP 5.3 or higher!' . PHP_EOL);
 
 # Extensions
 if (!extension_loaded('session'))	$error .= ('Error: PHP session extension not activated' . PHP_EOL);