How to Efficiently Remove Duplicate Arrays from a Multi-Dimensional Array in PHP?

Removing Duplicates from Multi-Dimensional Arrays in PHP

When working with multi-dimensional arrays, it can be necessary to eliminate duplicate values to ensure data integrity. Here's an efficient approach to achieve this in PHP.

Using array_map and serialize

We can leverage the array_map function to apply the serialize function to each array in the multi-dimensional array. Serializing converts each array to a unique string representation. Then, array_unique eliminates duplicate string representations. Finally, we unserialize the unique strings back into their corresponding arrays.

$input = array_map("unserialize", array_unique(array_map("serialize", $input)));

Example

Let's consider an example multi-dimensional array.

$input = [
    [0 => 'abc', 1 => 'def'],
    [0 => 'ghi', 1 => 'jkl'],
    [0 => 'mno', 1 => 'pql'],
    [0 => 'abc', 1 => 'def'],
    [0 => 'ghi', 1 => 'jkl'],
    [0 => 'mno', 1 => 'pql'],
];

After applying the above code, the duplicate values are removed, resulting in:

[
    [0 => 'abc', 1 => 'def'],
    [0 => 'ghi', 1 => 'jkl'],
    [0 => 'mno', 1 => 'pql'],
]

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