What potential issues can arise when comparing arrays with simple data types in PHP?

When comparing arrays with simple data types in PHP, the comparison operator (==) may not work as expected because it compares the values and keys of the arrays. To compare arrays based on their values only, you can use the array_diff() function to compare the values of two arrays and return the differences.

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

// Compare arrays based on values
if (empty(array_diff($array1, $array2)) && empty(array_diff($array2, $array1))) {
    echo "Arrays are equal based on values.";
} else {
    echo "Arrays are not equal based on values.";
}