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How can PHP developers secure forms on their websites to prevent misuse or malicious input?

To secure forms on their websites, PHP developers can implement input validation and sanitization to prevent misuse or malicious input. This can include checking for expected data types, lengths, and formats, as well as using functions like htmlspecialchars() to prevent cross-site scripting attacks.

php 
// Example PHP code snippet for securing a form input
$user_input = $_POST['user_input']; // Assuming the input comes from a POST request

// Validate and sanitize the input
if (ctype_alnum($user_input)) {
    $clean_input = htmlspecialchars($user_input);
    // Proceed with processing the sanitized input
} else {
    // Handle invalid input error
    echo "Invalid input. Please try again.";
}

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