Re: include_path and php

["Don Freeman" <DFreeman@xxxxxxxxxxxxxxx>]

> -----Original Message-----
> From: web400-bounces@xxxxxxxxxxxx 
> [mailto:web400-bounces@xxxxxxxxxxxx]On
> Behalf Of Scott Johnson
> Sent: Tuesday, March 28, 2006 4:17 PM
> To: Web Enabling the AS400 / iSeries
> Subject: Re: [WEB400] include_path and php
> 
> Newbie here:  What are the pluses and minuses of include vs 
> require vs require_once.
> 
>
 
Use include() when the code to evaluate is optional, that way, if the file is 
not found, the script continues running and only generates a warning message. 
i.e.: help files.

Use require() when the code to evaluate is mandatory for the successful running 
of the script.  If the file is not found the script ends and generates an error 
message. i.e.: business function definitions.

Both functions have the "_once" variation and are used if it is possible that 
the include() or require() functions can be parsed more the once and you don't 
want the secondary or tertiary evaluations to step on previously assigned 
variables.  Beware of using these unnecessarily as they do slow down execution 
of the script.  I've never been in a position where I have had to use either of 
these variations so can't give you a real world example but maybe the manual 
can help you out there:

http://us3.php.net/manual/en/function.include-once.php

Cheers,
Don 
--
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