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Alex Rivera
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I have a 2d array and need to isolate the unique columns from one column. $array = [ [..., 'key' => 1, ...], [..., 'key' => 2, ...], [..., 'key' => 3, ...], [..., 'key' => 1, ...], [..., 'key' => 2, ...], [..., 'key' => 3, ...], [..., 'key' => 4, ...], [..., 'key' => 5, ...], [..., 'key' => 6, ...] ]; How do I add elements to the result array only if they aren't in there already? I have the following: $a = []; // organize the array foreach ($array as $k => $v) { foreach ($v as $key => $value) { if ($key == 'key') { $a[] = $value; } } } print_r($a); Output: Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 1 [4] => 2 [5] => 3 [6] => 4 [7] => 5 [8] => 6 ) Instead, I want $a to consist of the unique values. (I know I can use array_unique() after looping to get the desired results, but I just want to know of any other ways.)
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