How can I set a default variable to a function in PHP? In python, it would look like this:
def fun(con = predefined):
I've tried the following to no avail:
function fun($con = $GLOBALS['con']){}
In this instance, as you can see, I would like to set the value to the definition of a global variable.
This is a very simple example:
<?php
function makecoffee($type = "cappuccino")
{
return "Making a cup of $type.\n";
}
echo makecoffee();
echo makecoffee(null);
echo makecoffee("espresso");
?>
The above example will output:
Making a cup of cappuccino.
Making a cup of .
Making a cup of espresso.
Looks like your problem is that you're trying to set a default from a global. PHP may not like this. You can circumvent it this way:
function fun($con = null){
$con or $con = $GLOBALS['con'];
}
I personally think this is kind of hokey. It looks like you're wanting to get a DB connection from a global resource. I don't think that's how this should be done, but this answer would allow $con to be set from global if not passed to the function. Or allow it to be used if passed.
We build a small class to use the globals in a static way
class globy{
static public function set($name, $value) { $GLOBALS[$name] = $value; }
static public function get($name) { return $GLOBALS[$name]; }
}
then you can do this
function fun($con=globy::get('con')){}
or you can do this (not your question)
function fun($con=globy::set('con','value_of_con')){}