How do I remove a key from an array?

[shelbytll]

Hi,
if I have the following:
$a[userid] = "manny";
$a[name] = "Manny P";
$a[email] = "[e-mail]";

how can I remove userid from the array?

I just want to remove a key from an array.

[laserlight]

could try using unset()

[shelbytll]

Tried.
The key still exist though the values is empty.

[laserlight]

Well, then you could do it the long way:

$array = array();
foreach ($a as $key => $val) {
	if ($key != 'userid')
		$array[$key] = $val;
}
$a = $array;

[shelbytll]

But that's not very feasible.

if I have 20 keys and need to remove 10 then i have to compare so many of them...

[laserlight]

well, an idea would be:

<?php
//we shall unset values corresponding to this array
$delkeys = array('userid', 'username', 'password');
foreach ($delkeys as $key) {
	unset($a[$key]);
}

//now loop through the $a array keeping only non-NULL elements
$array = array();
foreach ($a as $key => $va) {
	if ($val != NULL)
		$array[$key] = $val;
}
$a = $array;
?>