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

When defining and using variables in PHP, it is important to follow best practices to ensure clean and efficient code. Some best practices include using meaningful variable names, initializing variables before use, and avoiding global variables whenever possible. 

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

// Use meaningful variable names
$firstName = 'John';
$lastName = 'Doe';

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

// Avoid global variables whenever possible
function calculateTotal($quantity) {
    $price = 10;
    $total = $price * $quantity;
    return $total;
}

echo calculateTotal(5); // Output: 50

Keywords

variable declaration variable scope global keyword superglobals naming conventions

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