CODEWITHSUNDEEP
phparraysmultidimensional-array
kevin_marcus
kevin_marcus

Reputation: 277

Checking duplicate for multidimensional arrays (3rd level)

I have a 3 levels of multi dimensional arrays and I wanted to check for duplicates and only should return true or false. I tried doing the array_unique() but I think this one only works for single level array. My array looks like this:

array(
   0 => array(
               0=> array(
                          0=> "A"
                          1=> "B"
                          2=> "C"
                        )
               1=> array(
                          0=> "D"
                          1=> "E"
                          2=> "F"
                        )
               2=> array(
                          0=> "G"
                          1=> "H"
                          2=> "I"
                        )
               3=> array(
                          0=> "A"
                          1=> null
                          2=> null
                        )
             )

)

the expected result should be that "A" is already duplicated and should return true ,otherwise should be false. Please help. Thanks!

Upvotes: 2

Views: 43

Answers (1)

Eddie
Eddie

Reputation: 26844

You can flatten your array using RecursiveArrayIterator and RecursiveIteratorIterator. To check if there are duplicates, you can check the count of flattened array vs the count unique values of the flattened array.

$arr = //Your array
$it = new RecursiveIteratorIterator(new RecursiveArrayIterator($arr));
foreach($it as $v) $result[] = $v;

if ( count( $result ) !== count( array_unique( $result ) ) ) {
    echo "Duplicate"; //Return true
} else {
    echo "No Duplicate";
}

Upvotes: 1

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