How can developers efficiently handle case-insensitive string comparisons in PHP?

When comparing strings in PHP, developers often need to account for case-insensitivity to ensure accurate comparisons. One way to efficiently handle case-insensitive string comparisons is to use the strtolower() function to convert both strings to lowercase before comparing them. This ensures that the comparison is not affected by differences in letter case.

$string1 = "Hello";
$string2 = "hello";

if(strtolower($string1) === strtolower($string2)) {
    echo "The strings are equal (case-insensitive)";
} else {
    echo "The strings are not equal (case-insensitive)";
}