On quick question

Hey guys,
I just started to learn PHP, and I have a strong background Borland Delphi and HTML. But, I am new to this so i was hoping someone could help me out. Are their procedures? Like you have...

function what($var) {
blah
}

and in perl you can do a simple procedure without variables like

sub whatever{
blah
}

What would the 'sub' be equivilent to in PHP? I have a error message I want posted throughout a page if there are form errors, and i know i can just do include but I would rather use a procedure, at least to learn how its done. Here's the code im using...maybe i just messed up the syntax or something...

sub ErrorMsg {
echo "error message here";
}

Hope someone can help me out,
-Bryan

Just define it without arguments, but you do need to include the ():

function some_func()
{
do foo
}

then call it with

some_func();