(No version information available, might only be in SVN)
header_register_callback — Call a header function
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.
callback
Function called just before the headers are sent. It gets no parameters and the return value is ignored.
Zwraca TRUE
w przypadku powodzenia, FALSE
w
przypadku błędu.
Przykład #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";
?>
Powyższy przykład wyświetli coś podobnego do:
Content-Type: text/plain a
header_register_callback() is executed just as the headers are about to be sent out, so any output from this function can break output.
Informacja:
Headers will only be accessible and output when a SAPI that supports them is in use.