php getting unique values of a multidimensional array [duplicate]

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array_unique is using string conversion before comparing the values to find the unique values:

Note: Two elements are considered equal if and only if (string) $elem1 === (string) $elem2. In words: when the string representation is the same. The first element will be used.

But an array will always convert to Array:

var_dump("Array" === (string) array());

You can solve this by specifying the SORT_REGULAR mode in the second parameter of array_unique:

$unique = array_unique($a, SORT_REGULAR);

Or, if that doesn’t work, by serializing the arrays before and unserializing it after calling array_unique to find the unique values:

$unique = array_map('unserialize', array_unique(array_map('serialize', $a)));

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