In PHP, when should values in superglobals like $_POST be modified, if ever?

Modifying values directly in superglobals like $_POST is generally not recommended as it can lead to unexpected behavior and security vulnerabilities. It is best practice to sanitize and validate input data from superglobals before using them in your application. If you need to modify the values, create a copy of the superglobal array and work with the copy instead. 

// Sanitize and validate input data from $_POST before using it
$cleanData = [];
foreach ($_POST as $key => $value) {
    $cleanData[$key] = sanitizeInput($value);
}

// Function to sanitize input data
function sanitizeInput($input) {
    // Sanitize input data here
    return $sanitizedInput;
}

Keywords

PHP superglobals $_POST modification security

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