check if in array

[sethadam1]

I have a project and need help with something that's probably very simple:

I have an array of items, for example, $arr below, and I add each item to $usedarray as I use it. Later, I want to pull only items that haven't been echoed already. Anyone have a quick script that might check if a value is in an array?

$arr[0] = "a";
$arr[1] = "b";
$arr[2] = "c";
$arr[3] = "d";

$usedarray = array();

Thanks

Adam

[marcel]

check array_keys() function

http://www.php.net/manual/en/function.array-keys.php

array_keys($an_array, $a_value);

PM

[sethadam1]

Thanks for your help, Marcel, but I checked it out and my PHP is only version 4, so array_key_exists does work. Also, it appears that the other suggestion:

if(isset($search_array["first"]))

is for sub-array, because instead of searching for say, the value 45, if might look for

$seach_array[45]

Anyone have another suggestion?

[sethadam1]

Update...

this works:
$os = array ("Mac", "NT", "Irix", "Linux");
if (in_array ("Irix", $os)) {
print "Got Irix";
}
if (in_array ("mac", $os)) {
print "Got mac";
}

but this doesn't:

function makeset($numsongs) {
$seed = 1;
while ($seed <= $numsongs) {
$songnum = rand(0, $songcount); //gets a random song number
$tune = $song[$songnum];
if (in_array($tune, $playedsongs)) {
echo "duplicate song!<br>";
} else {
echo "$tune";
$playedsongs[] = "$tune"; }
$seed++; }
}