getservbyportheader_register_callback
(No version information available, might only be in SVN)
header_register_callback — Call a header function
Descrição
Registers a function that will be called when PHP starts sending output.
The callback is executed just after PHP prepares all headers to be sent, and before any other output is sent, creating a window to manipulate the outgoing headers before being sent.
Parâmetros
- callback
-
Function called just before the headers are sent. It gets no parameters and the return value is ignored.
Valor Retornado
Retorna TRUE em caso de sucesso ou FALSE em falhas.
Exemplos
Exemplo #1 header_register_callback() example
<?php
header('Content-Type: text/plain');
header('X-Test: foo');
function foo() {
foreach (headers_list() as $header) {
if (strpos($header, 'X-Powered-By:') !== false) {
header_remove('X-Powered-By');
}
header_remove('X-Test');
}
}
$result = header_register_callback('foo');
echo "a";
?>
O exemplo acima irá imprimir algo similar a:
Content-Type: text/plain a
Notas
header_register_callback() is executed just as the headers are about to be sent out, so any output from this function can break output.
Nota:
Headers will only be accessible and output when a SAPI that supports them is in use.
Veja Também
- headers_list() - Returns a list of response headers sent (or ready to send)
- header_remove() - Remove previously set headers
- header() - Send a raw HTTP header
header_register_callback