What best practices can be recommended for improving the PHP code functionality?

Issue: To improve PHP code functionality, it is recommended to follow best practices such as using proper naming conventions, organizing code into functions and classes, avoiding global variables, utilizing comments for documentation, and implementing error handling. PHP Code Snippet: 

<?php

// Example of improved PHP code following best practices

class Calculator {
    public function add($num1, $num2) {
        return $num1 + $num2;
    }

    public function subtract($num1, $num2) {
        return $num1 - $num2;
    }
}

$calculator = new Calculator();
$result = $calculator->add(10, 5);
echo "Addition result: " . $result;

$result = $calculator->subtract(10, 5);
echo "Subtraction result: " . $result;

?>

Keywords

refactoring code optimization error handling security measures performance tuning

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