How can the use of global variables in PHP affect the transfer of data between scripts?

Using global variables in PHP can make the transfer of data between scripts more prone to errors and harder to track. It can lead to unexpected changes in variables due to their global scope, making debugging more difficult. To avoid these issues, it's better to use proper data transfer methods like passing variables as function parameters or using sessions. 

// Instead of using global variables, pass data as function parameters or use sessions

// Passing data as function parameters
function processData($data) {
    // Process data here
}

$data = "example data";
processData($data);

// Using sessions
session_start();
$_SESSION['data'] = "example data";

// In another script
session_start();
$data = $_SESSION['data'];

Keywords

global variables data transfer PHP scripts variable scope side effects

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