What are common pitfalls when comparing strings using $_POST in PHP?

When comparing strings using $_POST in PHP, a common pitfall is not considering case sensitivity. To avoid this issue, you can use the strtolower() function to convert both strings to lowercase before comparing them. This ensures that the comparison is case-insensitive. 

$userInput = $_POST['user_input'];
$expectedInput = "password123";

if (strtolower($userInput) === strtolower($expectedInput)) {
    echo "Strings match!";
} else {
    echo "Strings do not match.";
}

Keywords

$_POST string comparison type coercion strict comparison vulnerability

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