Even though I’ve been using php for a few months now, I have a quick question (that’s why I’ve posted in the beginners section).
Let’s say you had a custom function.
function name_me_plz ($var_1, $var_2, $var_3 = '') {
// Do stuff here
}What does $var_3 do? Does it set it to the value I’ve put (which is nothing)? If so, is that considered being null?
yes and no.
it will be set to ‘’ in you call the function with 2 arguments
name_me_plz (‘a’,‘b’,‘c’)
$var3=‘c’
name_me_plz (‘a’,‘b’)
$var3=’’
but an empty string is not null
Right. So, just one more thing. I can easily override it, right? Something like this?
function name_me_plz($var_1, $var_2, $var_3 = '') {
// Blah
$var_3 = $_POST['var_3'];
// Do other stuff here
}Yes, you can.
But I think that this will be better:
[php]
function name_me_plz($var_1, $var_2, $var_3 = ‘’) {
// Blah
$var_3 = (isset($_POST[‘var_3’]) ? $_POST[‘var_3’] : ‘’) ;
// Do other stuff here
}
[/php]
Basically what it does is give $var3 a default value, and makes it optional. It keeps the PHP engine from screaming bloody hell when you only provide two parameters when callilng the function 