There are several methods of enabling 5.3 on your account while the default is still 5.2
Method 1:
Rename your script from .php to .php53
Method 2:
Login to cPanel then click "Apache Handlers" near the bottom of the screen and put the following in the top two boxes
Handler: application/x-httpd-php53
Extension(s): php
Method 3:
Add the following to your .htaccess file:
AddHandler application/x-httpd-php53 .php
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