writing basic functions?

[Admin]

i need a tutorial on writing PHP functions. anyone know of anything good?

[sde]

PHP Code:

<?
function sayWhat()
{
  return "What";
}

echo sayWhat();

function saySomething($string)
{
  return $string;
}

echo saySomethingElse("something");

function doSomething($string1,$string2,$string3,$string4)
{
  return $string1 . " " . $string2 . " " . $string3 . " " . $string4;
}

echo saySomethingElse("Matt","is","1337","Coder");

function add($x,$y)
{
  return $x + $y;
}
echo add(2,3);  // echos 5
?>

are you kidding matt?

[Admin]

i want to know all the rules when writing functions dude. sometimes i get stuck on something simple and it would be nice to just know exactly what is going on help figure some **** out.

[joe_bruin]

PHP Code:

<?
/*
 * global variables.
 */
$x = 5;
function foo()
{
  global $x;
  echo $x."\n";
}
foo(); // prints 5

/*
 * default values
 */
function bar($y = "BAR")
{
  echo $y."\n";
}
bar(); // prints 'BAR'

/*
 * passing by reference
 */
function ref(&$z)
{
  echo $z."\n";
}  
$z = "dude";
ref($z); // prints "dude" without making a copy of the string

/*
 * function pointers
 */
function asdf()
{
  echo "hi\n";
}
$fx = "asdf";
$$fx(); // prints "hi"
?>

[sde]

wow, had no idea you could pass by reference in php.

thanks joe