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[juninhoguitarr]

TODA VEZ QUE PRECISO DE AUTENTICAÇÃO COMO COOKIE OU SESSION
APARECE ESSAS MENSAGENS DE ERRO.

ISSO É NA PÁGINA DE LOGIN QUE É BASEADA EM COOKIE

Warning: Cannot modify header information - headers already sent by (output started at /home/wa/public_html/includes/menuDropDown.php:58) in /home/wa/public_html/login.php on line 20

Warning: Cannot modify header information - headers already sent by (output started at /home/wa/public_html/includes/menuDropDown.php:58) in /home/wa/public_html/login.php on line 21

Warning: Cannot modify header information - headers already sent by (output started at /home/wa/public_html/includes/menuDropDown.php:58) in /home/wa/public_html/login.php on line 22

Warning: Cannot modify header information - headers already sent by (output started at /home/wa/public_html/includes/menuDropDown.php:58) in /home/wa/public_html/login.php on line 23

E ESSAS É MENSAGEM ESTÁ EM UMA PÁGINA QUE TEM SESSION.

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/wa/public_html/includes/menuDropDown.php:58) in /home/wa/public_html/mural.php on line 2

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/wa/public_html/includes/menuDropDown.php:58) in /home/wa/public_html/mural.php on line 2

[Daniel]

Vc esta tentando redirecionar uma pagina que ja teve algo impresso, as funcoes header e session_start devem estar antes de qualquer saida html.