What security measures should be taken when dealing with Form Values and Arrays in PHP to prevent malicious code injection?

When dealing with Form Values and Arrays in PHP, it is important to sanitize and validate user input to prevent malicious code injection. One way to do this is by using functions like htmlspecialchars() to encode special characters and prevent XSS attacks. Additionally, using functions like filter_input() or filter_var() with appropriate filters can help validate input and prevent SQL injection attacks. 

// Sanitize form values using htmlspecialchars()
$name = htmlspecialchars($_POST['name']);
$email = htmlspecialchars($_POST['email']);

// Validate form values using filter_input()
$age = filter_input(INPUT_POST, 'age', FILTER_VALIDATE_INT);

// Example of validating an array of values
$ids = $_POST['ids'];
$filteredIds = array_map('intval', $ids);

Keywords

XSS SQL injection htmlspecialchars filter_input validation

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