What is the difference between stripos() and strpos() in PHP?

The main difference between stripos() and strpos() in PHP is that stripos() performs a case-insensitive search for a substring within a string, while strpos() is case-sensitive. This means that stripos() will return the position of the first occurrence of the substring in the string regardless of case, while strpos() will only return the position if the case matches exactly. To use stripos() in PHP to perform a case-insensitive search for a substring within a string, simply replace any instances of strpos() with stripos() in your code.

$string = "Hello World";
$substring = "hello";

if (stripos($string, $substring) !== false) {
    echo "Substring found in the string.";
} else {
    echo "Substring not found in the string.";
}