<br /> <b>Fatal error</b>: Uncaught Error: Class &quot;_a&quot; not found in /var/www/domains/cmsws.com/examples/php/design_patterns/singleton.php:6 Stack trace: #0 {main} thrown in <b>/var/www/domains/cmsws.com/examples/php/design_patterns/singleton.php</b> on line <b>6</b><br />