How Can I Remove Duplicate Values from a PHP Array?

Removing Duplicate Values from Arrays in PHP

When dealing with arrays in PHP, it may be necessary to remove duplicate values to ensure data accuracy and efficiency.

Solution: array_unique()

For one-dimensional arrays, the native array_unique() function effectively removes duplicate values. It retains the key-value pair of the first instance of each unique element, preserving key order.

$array = [1, 2, 2, 3];
$array = array_unique($array); // Array is now [1, 2, 3]

Note: array_unique() is not suitable for multi-dimensional arrays.

Reindexing Values

If desired, you can use array_values() to reindex the array, starting from 0:

$array = array_unique($array);
$array = array_values($array); // Array is now [1, 2, 3] with keys [0, 1, 2]

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