- <?php 
-   
- $subject = "RX3!Pl6HxTCD"; 
- if (substr($subject, 0, 2) === 'RX' && substr($subject, -2) === 'CD') { 
-     echo "$subject\n"; 
- } 
				PD9waHAKCiRzdWJqZWN0ID0gIlJYMyFQbDZIeFRDRCI7CmlmIChzdWJzdHIoJHN1YmplY3QsIDAsIDIpID09PSAnUlgnICYmIHN1YnN0cigkc3ViamVjdCwgLTIpID09PSAnQ0QnKSB7CiAgICBlY2hvICIkc3ViamVjdFxuIjsKfQ==