What is the error "Fatal error: Call to undefined function session_register()" in PHP code, and how can it be resolved?

The error "Fatal error: Call to undefined function session_register()" occurs because the function session_register() has been deprecated in PHP 5.3.0 and removed in PHP 5.4.0. To resolve this error, you can use the $_SESSION superglobal array to register session variables instead. 

<?php
session_start();

$_SESSION['variable_name'] = 'value';
?>

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Fatal error Call to undefined function session_register PHP code resolved

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