[SOLVED] Can anyone tell me what this expression means?

[ted_chou12]

$username = isset($_POST["username"])?$_POST["username"]:"";

This is a piece of code from a script I have found, but I dont understand what this means, I tried searching it in manual, however, only found about the isset() not the ?:"" parts, can anyone kindly explain to me what the code means?

 

Thanks

Ted

[obsidian]

That's called the ternary operator. It's the equivalent of saying the following:

<?php
if (isset($_POST['username'])) {
  $username = $_POST['username'];
} else {
  $username = '';
}
?>

[per1os]

if the post username isset then (?) set username to post username else ( set it to ""

[ted_chou12]

thanks, I see how it works now.