beggining and ending a block of the php

 when wrinting php your are need to inform the php engine that you want it to exevute your commands if your dont this the code your write will be mistake for html  and will be output to the browser you can design the your php code with special tags that marks the beginnging and end of  the php code blocks only the satanded and script tags are guaranteed to work on any configuration the short and asp-style tags you must make sure that the short the short open tag switch is set to on in the php.ini