How can I remove duplicate value in foreach statement?

How can I remove the duplicate values in the foreach statement?

Here is my $data array:

Array ( [0] => Array ( [idx] => 1 [id] => 1 [mname] => test1 [hname]
=> test1 [bdate] => 0000-00-00 ) [1] => Array ( [idx] => 2 [id] => 1 [mname] => test1 [hname] => test1 [bdate] => 0000-00-00 ) [2] => Array
( [idx] => 3 [id] => 1 [mname] => test1 [hname] => test1 [bdate] =>
0000-00-00 ) [3] => Array ( [idx] => 4 [id] => 1 [mname] => test1
[hname] => test1 [bdate] => 2024-01-01 ) [4] => Array ( [idx] => 5
[id] => 1 [mname] => test1 [hname] => test1 [bdate] => 2024-01-03 )
[5] => Array ( [idx] => 6 [id] => 1 [mname] => test1 [hname] => test1
[bdate] => 2024-01-05 ) [6] => Array ( [idx] => 7 [id] => 1 [mname] =>
test1 [hname] => test1 [bdate] => 2024-01-07 ) [7] => Array ( [idx] =>
8 [id] => 1 [mname] => test1 [hname] => test1 [bdate] => 2024-01-09 )
[8] => Array ( [idx] => 9 [id] => 1 [mname] => test1 [hname] => test1
[bdate] => 0000-00-00 ) [9] => Array ( [idx] => 10 [id] => 1 [mname]
=> test1 [hname] => test1 [bdate] => 2024-01-20 ) [10] => Array ( [idx] => 11 [id] => 1 [mname] => test1 [hname] => test1 [bdate] =>
0000-00-00 ) [11] => Array ( [idx] => 12 [id] => 1 [mname] => test1
[hname] => test1 [bdate] => 0000-00-00 ) [12] => Array ( [idx] => 13
[id] => 1 [mname] => test1 [hname] => test1 [bdate] => 0000-00-00 )
[13] => Array ( [idx] => 14 [id] => 1 [mname] => test1 [hname] =>
test1 [bdate] => 2024-01-22 ) [14] => Array ( [idx] => 15 [id] => 1
[mname] => test1 [hname] => test1 [bdate] => 2024-01-22 ) [15] =>
Array ( [idx] => 16 [id] => 1 [mname] => test1 [hname] => test1
[bdate] => 2024-01-22 ) [16] => Array ( [idx] => 17 [id] => 1 [mname]
=> test1 [hname] => test1 [bdate] => 2024-01-22 ) [17] => Array ( [idx] => 18 [id] => 1 [mname] => test1 [hname] => test1 [bdate] =>
2024-01-22 ) [18] => Array ( [idx] => 19 [id] => 1 [mname] => test1
[hname] => test1 [bdate] => 2024-01-22 ) [19] => Array ( [idx] => 20
[id] => 1 [mname] => test1 [hname] => test1 [bdate] => 2024-01-22 )
[20] => Array ( [idx] => 21 [id] => 1 [mname] => test1 [hname] =>
test1 [bdate] => 2024-01-22 ) [21] => Array ( [idx] => 22 [id] => 1
[mname] => test1 [hname] => test1 [bdate] => 2024-01-22 ) [22] =>
Array ( [idx] => 23 [id] => 1 [mname] => test1 [hname] => test1
[bdate] => 2024-01-22 ) [23] => Array ( [idx] => 24 [id] => 1 [mname]
=> test1 [hname] => test1 [bdate] => 2024-01-22 ) [24] => Array ( [idx] => 25 [id] => 1 [mname] => test1 [hname] => test1 [bdate] =>
2024-01-22 ) [25] => Array ( [idx] => 26 [id] => 1 [mname] => test1
[hname] => test1 [bdate] => 2024-01-22 ) [26] => Array ( [idx] => 27
[id] => 1 [mname] => test1 [hname] => test1 [bdate] => 2024-01-22 )
[27] => Array ( [idx] => 28 [id] => 1 [mname] => test1 [hname] =>
test1 [bdate] => 2024-01-22 ) [28] => Array ( [idx] => 31 [id] => 1
[mname] => test1 [hname] => test1 [bdate] => 2024-01-22 ) [29] =>
Array ( [idx] => 32 [id] => 1 [mname] => test1 [hname] => test1
[bdate] => 2024-01-22 ) )

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Code

<?php
    foreach ($data as $row){
        if($row['bdate'] == '0000-00-00'){
            continue;
        }
        echo '<li>'.$row['bdate'].'</li>';
    }
?>

It displays like the following.

2024-01-01
2024-01-03
2024-01-05
2024-01-07
2024-01-09
2024-01-20
2024-01-22
2024-01-22
2024-01-22
2024-01-22
2024-01-22
2024-01-22
2024-01-22
2024-01-22
2024-01-22
2024-01-22
2024-01-22
2024-01-22
2024-01-22
2024-01-22
2024-01-22
2024-01-22
2024-01-22

But what I want to display like this:

2024-01-01
2024-01-03
2024-01-05
2024-01-07
2024-01-09
2024-01-20
2024-01-22

How can I remove duplicated same date value ?

>Solution :

Try using an associative array. You can keep track of the dates that have already been printed.

$printed_dates = array();
foreach ($data as $row){
    if($row['bdate'] == '0000-00-00' || isset($printed_dates[$row['bdate']])){
        continue;
    }
    $printed_dates[$row['bdate']] = true;
    echo '<li>'.$row['bdate'].'</li>';
}