Duplicated entries in array

[EagerWolf]

I have an array. I need to check if key (key => value) is being duplicated... I've already checked all values not to be duplicated and found out they are..

 

I am trying to make script which would print me which key is being duplicated.

 

Thanks for help!

 

[Orio]

I don't really understand what you want.

You can use array_keys() with the search parameter to find all of the keys that have the same value.

 

Orio.

[Barand]

You can't duplicate keys

 

<?php
$a = array (
     'a' => 1,
     'b' => 2,
     'c' => 3,
     'b' => 4,                 // overwrites earlier key
     'd' => 5
);

echo '<pre>', print_r($a, true), '</pre>';
?>

[EagerWolf]

I have got very long file ... and I know that duplicated key rewrites earlier... That is what I want to prevent with script I am trying to do ..

[Barand]

Before adding to the array check if key value is there already

<?php
if (isset($array[$key])) {
         echo "Duplicate : $key <br>";
}
else {
        $array[$key] = $someValue;
}
?>

 

[EagerWolf]

I've used this method already, but in my case I got array which has about 1000 entries ... and I should check if any key is duplicated.. Thanks for idea anyway...