What are the potential performance differences between using local variables and superglobals in PHP?

Using local variables in PHP is generally more efficient than using superglobals like $_POST or $_GET. This is because accessing local variables is faster since they are stored in the memory of the current script execution, while superglobals are stored in the global scope and require additional overhead to access. To improve performance, it's recommended to assign superglobal values to local variables at the beginning of your script and then work with those local variables instead. 

// Assign superglobal values to local variables for better performance
$name = $_POST['name'];
$email = $_POST['email'];

// Use local variables instead of superglobals in the rest of your script
echo "Name: " . $name . "<br>";
echo "Email: " . $email;

Keywords

local variables superglobals performance differences PHP optimization

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