session_start(): Cannot start session when headers already sent in <b>/home/gzwdkivb/gestionaledolmen.it/sw/api/api.php</b> on line <b>8</b><br /> code example

Example: session_start(): cannot start session when headers already sent

// FIRST line of each php file using session (no character before)
<?php if ( empty(session_id()) ) session_start(); ?>
// Encode in ANSI or UTF8 (No BOM !)