How do you find ONLY unique strings in an array?

[instaunt]

I have a list of 4000 web addresses. I need to extract all the web addresses that only occur once. Any that are in the list twice or more I don't want to know about.

How do you extract unique strings?

Thanks
Mike

[Arcticwarrio]

PHP Code:

<?php
$input = array("a" => "green", "red", "b" => "green", "blue", "red");
$result = array_unique($input);
print_r($result);
?>

The above example will output:

Array
(
[a] => green
[0] => red
[1] => blue
)

[Dormilich]

@arctic: I think he meant not to exclude duplicate values, but to find values that that are present once and only once.

array_count_values() (and array_filter()) should be what you’ll need.