[RESOLVED] Remove BOTH duplicates in array -- array_unique???

[itsallgood]

Hi guys,

How can you remove both copies of duplicates in an array using array_unique?

For example...

$input = array("green", "green", "red","red","blue");
$result = array_unique($input);

result:

blue

So if a work is in more then once, both are removed...

$input = array("Apple", "Tree", "Black","Red","Red","Apple","Green");
$result = array_unique($input);

result:

Tree, Green

Thanks so much for any help! 😃

[scrupul0us]

It might seem obvious, but if you want to remove duplicates from an array, you can use array_flip() twice:
$arr = array_flip(array_flip($arr));

http://www.php.net/manual/en/function.array-flip.php#73660

not sure if it removes all or if it leaves a copy like unique would

[laserlight]

scrupul0us wrote:

not sure if it removes all or if it leaves a copy like unique would

It only removes the duplicates, rather than keeping only those that are unique to begin with.

I suggest:

$input = array("green", "green", "red","red","blue");
$count = array_count_values($input);
$result = array_values(array_filter($input, create_function('$x','global $count; return $count[$x] == 1;')));

If you have PHP 5.3, use the new style of anonymous functions instead of create_function.

[itsallgood]

Sorry laserlight, i've never used create_function before - and im finding it hard to work it out.

I've tried your code, and it returns an empty array when using print_r - not "blue"

I'm trying to go through the code, but not having much luck.

Cheers for the replies 🙂

[itsallgood]

Sorry -- just an update.

I'm sure your code works laserlight. Many thanks.

I'm using codeigniter and i think it may have had a problem with the way the function is made.

So i have come up with a solution based on what you showed me.

Many thanks!

Resolved! 🙂