Finding dupes in array

[weep]

Good day,

 

Is there a simple way to find and list duplicates i an array and insert these to a new one? I have:

 

$array[0] = "asd"

$array[1] = "ter"

$array[2] = "asd"

$array[3] = "asd"

$array[4] = "xfh"

 

From that, I need this:

 

$newarray[0] = "0"

$newarray[1] = "2"

$newarray[2] = "3"

 

I have poked around "array_not_unique" and "in_array" a bit, but can't wrap my head around it enough for it to work... Any and all help are much appreciated. Thanks in advance!

[wildteen88]

EDIT: Oh, I could of just used array_diff_key instead

 

$array[0] = "asd";
$array[1] = "ter";
$array[2] = "asd";
$array[3] = "asd";
$array[4] = "xfh";

$unique_values = array_unique($array);

$duplicate_values = array_diff_key($array, $unique_values);
echo '<pre>' . print_r($duplicate_values, true) . '</pre>';

 

Original post

I came up with

$array[0] = "asd";
$array[1] = "ter";
$array[2] = "asd";
$array[3] = "asd";
$array[4] = "xfh";

$unique_values = array_unique($array);

$duplicate_values = array();
foreach($array as $key => $value)
{
    if(!array_key_exists($key, $unique_values))
        $duplicate_values[] = $key;
}

echo '<pre>' . print_r($duplicate_values, true) . '</pre>';

[weep]

Hi, very sorry for the delay (I'm out on holidays) and thank you for this example! Additional question: Is there a way to limit these to "Where $array is == "something"?

 

Ie:

 

$array[0] = "asd";

$array[1] = "ter";

$array[2] = "asd";

$array[3] = "asd";

$array[4] = "xfh";

$array[5] = "xfh";

 

Your solution would print all dupes, but what if I am interested in only "asd"? How can I extract those, so I get:

 

$newarray[0] = "0"

$newarray[1] = "2"

$newarray[2] = "3"

 

and nothing more. Once again, thanks!

 

[wildteen88]

So you want to get the keys for each instance of asd within your array. You can use array_keys for this

$duplicate_values = array_keys($array, 'asd');
echo '<pre>' . print_r($duplicate_values, true) . '</pre>';

[weep]

Yep, that solved it all for me! Thank you very much!