What is the purpose of using strpos in PHP and what are the potential pitfalls when using it in conditional statements?

When using strpos in PHP to check for the existence of a substring within a string, it's important to remember that strpos returns false if the substring is not found. This can lead to potential pitfalls when using strpos in conditional statements, as false can be interpreted as 0, leading to unexpected behavior. To avoid this issue, it's recommended to use the strict comparison operator (===) to check the return value of strpos.

// Example code snippet to avoid pitfalls when using strpos in conditional statements
$string = "Hello, World!";
$substring = "Hello";

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