array_unique question

[Anon]

Hi,

I currently have PHP 4.0B2, I thought array_unique was available in PHP 4.

However I get "call to undefined function"
So it seems I don't have access to this function...

Does anybody have any suggestions on how I could code my own array_unique.

All I want to do is remove duplicate words from an array (or even a string)...

Any help is appreciated.

Thanx

[[deleted]]

I think an upgrade of your PHP version would be much better solution.

Anyway, Removing duplicates means:
Make a new array.
Loop through the original array, starting at the first element.
Check if that element exists in the new array.
If it does, do nothing.
If it doesn't, add it to the new array.
Move to the next element in the original array.

Pretty straightforward really.

[[deleted]]

If array_unique is giving you problems, then try this workaround:

$mixed_array = array("one", "one", "two", "three", "four", "three");
$unique_array = array();

My preferred method is using the foreach():

foreach($mixed_array as $array_value) {
if(in_array($array_value, $unique_array)) continue;
array_push($unique_array, $array_value);
}

Or if you prefer, you can also use the while() loop, but remember to reset the array before going through.

reset($mixed_array);
while(list(, $array_value) = each($mixed_array)) {
if(in_array($array_value, $unique_array)) continue;
array_push($unique_array, $array_value);
}

Hope that helps...
Regards