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How can PHP developers effectively handle the passing of variables between different PHP scripts, as discussed in the thread?

To effectively handle the passing of variables between different PHP scripts, developers can use sessions or cookies to store and retrieve data. Sessions are stored on the server and can hold more data securely, while cookies are stored on the client's browser. By using these methods, developers can pass variables between scripts seamlessly.

php 
// Script 1: Setting a session variable
session_start();
$_SESSION['username'] = 'JohnDoe';

// Script 2: Retrieving the session variable
session_start();
echo $_SESSION['username'];

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