header_register_callback

(PHP 5 >= 5.4.0, PHP 7)

header_register_callbackCall a header function

설명

bool header_register_callback ( callable $callback )

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.

인수

callback

Function called just before the headers are sent. It gets no parameters and the return value is ignored.

반환값

성공 시 TRUE를, 실패 시 FALSE를 반환합니다.

예제

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

주의

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.

참고

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User Contributed Notes 1 note

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4
matt@kafene
7 years ago
Note that this function only registers a single callback as of php 5.4. The most recent callback set is the one that will be executed, they will not be executed in order like with register_shutdown_function(), just overwritten.

Here is my test:

<?php

$i
= $j = 0;
header_register_callback(function() use(&$i){ $i+=2; });
header_register_callback(function() use(&$i){ $i+=3; });
register_shutdown_function(function() use(&$j){ $j+=2; });
register_shutdown_function(function() use(&$j){ $j+=3; });
register_shutdown_function(function() use(&$j){ var_dump($j); });
while(!
headers_sent()) { echo "<!-- ... flushing ... -->"; }
var_dump(headers_sent(), $i);
exit;

?>

Results:

headers_sent() - true
$i = 3
$j = 5
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