What are some best practices for handling variables in PHP to avoid overwriting values?

To avoid overwriting values of variables in PHP, it is best practice to use unique and descriptive variable names, avoid using global variables, and properly scope variables within functions or classes. Additionally, utilizing constants for values that should not be changed can help prevent accidental overwriting. 

// Example of using unique and descriptive variable names
$firstName = 'John';
$lastName = 'Doe';

// Example of scoping variables within a function
function calculateArea($length, $width) {
    $area = $length * $width;
    return $area;
}

// Example of using constants
define('PI', 3.14);
$radius = 5;
$circleArea = PI * $radius * $radius;

Keywords

variable scope variable naming conventions constant variables global keyword variable validation

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