In what ways can peer code review and collaboration help in identifying and resolving PHP code errors effectively?

Peer code review and collaboration can help in identifying and resolving PHP code errors effectively by allowing multiple developers to review the code for errors, providing feedback on potential improvements, and sharing knowledge and best practices. Through collaboration, developers can catch syntax errors, logic errors, and performance issues early on, leading to a more robust and efficient codebase.

// Example PHP code snippet demonstrating peer code review and collaboration
function calculateTotal($price, $quantity) {
    // Check if price and quantity are numeric values
    if (!is_numeric($price) || !is_numeric($quantity)) {
        return "Invalid input. Please provide numeric values for price and quantity.";
    }
    
    // Calculate total price
    $total = $price * $quantity;
    
    return $total;
}

// Usage example
$price = 10;
$quantity = 5;
echo calculateTotal($price, $quantity);