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For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

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#define in PHP

Posted by stockton (stockton), 10 August 2007
I hope that this is not the wrong forum but I would like to do the same as one would in C and that is in an included configuration file #define a variable that could then be checked throughout the rest of the PHP system for TRUE or FALSE.
In C I used to #define TRUE 1 then #define FALSE !TRUE and therefore one could #define SQL TRUE
Effectively I would like to
& then further on in the system
if ($SGM)
echo '<script language="JavaScript" type="text/javascript" src="js/ajaxSGM.js"></script>';
echo '<script language="JavaScript" type="text/javascript" src="js/ajax.js"></script>';


Is this possible or better yet is there a better way?

Posted by admin (Graham Ellis), 11 August 2007
Hi, Alf.

The syntax you're using is more or less correct - although I would use 0 and 1 for true and false.

It's common practice to have a whole file of constants and settings in a file you include in a number of PHP pages.    So the PHP will include:


and will include things like:

$SGM = 1;
$swlip = "";

Posted by stockton (stockton), 11 August 2007
Thank you, Graham.

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