How can i remove all keys in multidimensional array when first value are same in php

Question

How can get only unique value in array and how can remove blank array.

how can i check first value condition like mydata1 are unique if mydata1 are found more then one time then remove full array check my output..

Array
(
    [0] => Array
        (
            [0] => Mydata1
            [1] => first
            [2] => first
        )

    [1] => Array
        (
            [0] => 
            [1] => 
            [2] => 
        )

    [2] => Array
        (
            [0] => Mydata3
            [1] => second
            [2] => first
        )

    [3] => Array
        (
            [0] => Mydata1
            [1] => first
            [1] => dddemo
        )

    [4] => Array
        (
            [0] => Mydata1
            [1] => fourth
            [2] => first
        )

    [5] => Array
        (
            [0] => Mydata3
            [1] => fifth
            [2] => first
        )

    [6] => Array
        (
            [0] => Mydata2
            [1] => sixth
            [2] => first
        )

)

/////////////////////////////////////////////////////////////////

Output :

Array
(
    [0] => Array
        (
            [0] => Mydata1
            [1] => first
            [2] => first
        )

    [1] => Array
        (
            [0] => Mydata3
            [1] => second
            [2] => first
        )


    [2] => Array
        (
            [0] => Mydata2
            [1] => sixth
            [2] => first
        )

)

Answer 1

Okay, so here is my solution:

$array = [
    0 => [
        'Mydata1',
        'first',
        'first',
    ],
    1 => [
        null,
        null,
        null,
    ],
    2 => [
        'Mydata3',
        'second',
        'first',
    ],
    3 => [
        'Mydata1',
        'first',
        'dddemo',
    ],
    4 => [
        'Mydata1',
        'fourth',
        'first',
    ],
    0 => [
        'Mydata3',
        'fifth',
        'first',
    ],
    0 => [
        'Mydata2',
        'sixth',
        'first',
    ],
];
$newarray = [];
foreach ($array as $key => $data)
{
    $flag = true;
    foreach ($newarray as $new)
    {
        if ($new[0] == $data[0])
        {
            $flag = false;
        }
    }
    if ($flag && isset($data[0]))
    {
        $newarray[count($newarray)] = $data;
    }
}
var_dump($newarray);
// Outputs
array(3) {
    [0]=> array(3) {
        [0]=>
            string(7) "Mydata2"
        [1]=>
            string(5) "sixth"
        [2]=>
            string(5) "first"
    }
    [1]=> array(3) {
        [0]=>
            string(7) "Mydata3"
        [1]=>
            string(6) "second"
        [2]=>
            string(5) "first"
    }
    [2]=> array(3) {
        [0]=>
            string(7) "Mydata1"
        [1]=>
           string(5) "first"
        [2]=>
            string(6) "dddemo"
    }
}