(PHP 5 >= 5.4.0, PHP 7)
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.
성공 시 TRUE
를, 실패 시 FALSE
를 반환합니다.
Example #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";
?>
위 예제의 출력 예시:
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.
Note:
헤더는 SAPI에서 사용할 수 있을 경우에만 접근하고 출력할 수 있습니다.