- session_status: documentation ( source)
- print_r: documentation ( source)
- session_start: documentation ( source)
- session_id: documentation ( source)
<?php
print_r( 'El status '.session_status() );
//if ( session_status() !== PHP_SESSION_ACTIVE ) session_start();
if ( session_id() === "" ) session_start();
print_r( 'Luego el status '.session_status() );