php functions

[vinasite]

hi everyone,

i'm experimenting with a simple php script, and here's what it looks like:

if ($var1 == "222") {
write();
}
else {
echo("Error");
}


fuction write()
echo("this is a test");

but the function write() doesn't execute when i call the write(); , and i get an error from my server.
i'm pretty new to php so would somebody please help me out on how to call a function up.

Thank you
Sang N
sang@vinasite.com

[Kevin Yank]

Try replacing your write() function with the following:

function write() {
  echo("this is a test");
}

If this doesn't work, please let us know what the error message you're getting is.

[Edited by kyank on 09-23-2000 at 04:23 PM]

[vinasite]

hi,

the error i get is:
"Fatal error: Call to unsupported or undefined function write() in /home/vina/vinasite-www/validate.php on line 24
"

and on line 24, i have:
write();


Sang N.
sang@vinasite.com

[Kevin Yank]

You have misspelled "function" as "fuction".

[vinasite]

that's corrected, but i still get the same error...

[Kevin Yank]

The following code works perfectly here:

<?
$var1="222";

if ($var1 == "222") { 
  write(); 
} 
else { 
  echo("Error"); 
} 


function write() {
  echo("this is a test"); 
}
?>

[vinasite]

humm...
weird..

I guess it's a problem with my server's configuration.

Thanks for your help

[freddydoesphp]

It is possible that you may need to define your function above the call to it.
So this should work:
<?
function write() {
echo("this is a test");
}
$var1="222";
if ($var1 == "222") {
write();
}
else {
echo("Error");
}
?>

[vinasite]

Thanks

that worked!

[freddydoesphp]

No problem! If you were working in a class, you could call it from wherever using $this->functionname() but since it was stand alone you would have to define it before you could call it.

[Kevin Yank]

Odd. That was not required here (witness my code above). What version of PHP are you running?

[freddydoesphp]

4.0.2 and I have run into that situation several times, as the page is parsed by the server it goes on down the page and tries to run write() before it know s what it is. Not sure why it worked for you

[Kevin Yank]

4.0.1pl2 here... My test file contained only the code in my post above, and worked withtout a hitch. To satisfy my curiosity, would you care to try it on your own server?

From p.132 of "Professional PHP Programming" by WROX Press:

In PHP3, the function declaration must appear in the code before any invocations of the function. However, in PHP4 the function can be called prior to its declaration.

[freddydoesphp]

Don't you know "Curiosity killed the Cat!" No, just kidding it worked on my machine, so I don't know what happened with his machine?

[freddydoesphp]

Maybe he was runnning PHP3