How can multidimensional arrays be handled when using array_unique in PHP?

When using array_unique in PHP with multidimensional arrays, the function only works on the first level of the array. To handle multidimensional arrays, you can use array_map along with json_encode and json_decode to convert the arrays into strings, remove duplicates, and then convert them back to arrays. 

// Example multidimensional array
$multiArray = [
    ["a" => 1, "b" => 2],
    ["a" => 1, "b" => 2],
    ["a" => 3, "b" => 4]
];

// Use array_map, json_encode, and json_decode to handle multidimensional arrays
$uniqueArray = array_map("unserialize", array_unique(array_map("serialize", $multiArray)));

print_r($uniqueArray);

Keywords

multidimensional arrays array_unique PHP handling arrays

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