What are some best practices for declaring and using variables in PHP?

When declaring variables in PHP, it is important to follow best practices to ensure code readability and maintainability. Some key best practices include using meaningful variable names, initializing variables before use, and using appropriate data types. Additionally, it is recommended to avoid using global variables whenever possible to prevent potential conflicts and improve code modularity. 

// Example of declaring and using variables in PHP following best practices

// Using meaningful variable names
$userName = "John Doe";
$age = 30;

// Initializing variables before use
$total = 0;
$price = 10;

// Using appropriate data types
$isUserLoggedIn = true;
$items = array("apple", "banana", "orange");

// Avoiding global variables
function calculateTotal($price, $quantity) {
    $total = $price * $quantity;
    return $total;
}

$totalAmount = calculateTotal($price, 5);
echo "Total amount: $" . $totalAmount;

Keywords

variable declaration variable scope variable naming conventions global variables variable initialization

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