Ho corretto, mi esce il seguente errore se carico il file track.php (che contiene questo scritp)

Warning: Cannot modify header information - headers already sent by (output started at /htdocs/public/www/track.php:2) in /htdocs/public/www/track.php on line 5 ‰PNG  IHDRwSÞtRNSn¦‘ IDATxœc```ö8UIEND®B`‚