How can proper debugging techniques help resolve issues with array_diff in PHP?

When encountering issues with array_diff in PHP, proper debugging techniques can help identify the root cause of the problem. One common issue is incorrect data types or structures in the arrays being compared. To resolve this, you can use var_dump or print_r to inspect the arrays and ensure they are in the expected format before using array_diff.

$array1 = [1, 2, 3, 4];
$array2 = [2, 3, 4, 5];

// Debugging to check array structures
var_dump($array1);
var_dump($array2);

// Using array_diff after confirming array structures
$diff = array_diff($array1, $array2);

print_r($diff);