What are potential pitfalls when using array_diff() function in PHP?

When using the array_diff() function in PHP, one potential pitfall is that it only compares values and not keys. This means that if the arrays being compared have different keys but the same values, they will not be considered as a difference. To solve this issue, you can use the array_diff_assoc() function instead, which compares both keys and values. 

$array1 = array("a" => "red", "b" => "green", "c" => "blue");
$array2 = array("a" => "red", "b" => "green");
$diff = array_diff_assoc($array1, $array2);

print_r($diff);

Keywords

array_diff PHP arrays comparison elements

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