Are there any potential pitfalls to be aware of when using array_diff() in PHP for array comparison?

One potential pitfall when using array_diff() in PHP for array comparison is that it only compares values and not keys. If you need to compare both keys and values, you can use array_diff_assoc() instead. This function compares both the keys and values of two arrays. 

$array1 = ['a' => 1, 'b' => 2, 'c' => 3];
$array2 = ['a' => 1, 'b' => 2, 'd' => 4];

$diff = array_diff_assoc($array1, $array2);

print_r($diff);

Keywords

array_diff PHP array comparison comparison function data inconsistency

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