coding question

[wolf73]

I am trying to understand this code, I don't know what they are doing


define("DEBUG",false);



if ($_REQUEST['DEBUG'])
{
dl("no-debug-non-zts-20050922/xdebug.so");
xdebug_start_profiling();
}



****************

if (isset($_GET['app']))
{
$include_path="{$_GET['app']}/";
$s->check_includes($_GET['app'],"app");
}

 

[jpadie]

the definition is not used elsewhere in the script you have provided.

the first conditional tests the value of $_REQUEST['DEBUG'] this could be either a get, post of cookie array element called DEBUG. if it is set to TRUE then the xdebug.so dynamic php extension is loaded and a function within that library is called.

the second conditions tests to see whether a get element called "app" is set. if it is then a variable called $include_path is populated with the value of that array element with a trailing slash and a call to a method of an object ($s) is made with some variables.

 

[wolf73]

Thanks for your reply. Now

define("DEBUG",false);

Thats a constant that has nothing to do with
if ($_REQUEST['DEBUG'])

right

 

[jpadie]

correct.

if you had

$ARRAY['somevalue'] = "apple";
define ("DEBUG", "somevalue");
echo $ARRAY[DEBUG];

you would get

apple

as the array element has no quotes, php assumes at first that you are referencing a constant. The $_REQUEST is a superglobal construct made up of GET POST and COOKIE values and is independent of any constants set up in the script.