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If I make a POST request where the content-type is not set in the request header, the variable $_POST remains empty.

Question: How can I force PHP to fill $_POST?

I encountered the problem making an Javascript AJAX request using XDomainRequest where you can not define any headers. Just to make it easier for you to understand the problem you can simulate the same effect without Javascript in PHP this way:

$data = 'test=1';

$fp = fsockopen('www.yourpage', 80, $errno, $errstr, 5);
fputs($fp, "POST /test_out.php HTTP/1.1\r\n");
fputs($fp, "Host: www.yourpage\r\n");
//fputs($fp, "Content-type: application/x-www-form-urlencoded\r\n");
fputs($fp, "Content-length: ". strlen($data) ."\r\n");
fputs($fp, "Connection: close\r\n\r\n");
fputs($fp, $data);

while(!feof($fp)) { echo fgets($fp, 128); }
fclose($fp);

test_out.php would be

var_dump($_POST);

Without the correct content-type the variables in $_POST magically disappear.

This is more an educational question. I am asking this because most people here can not imaging that the content-type has this effect. I was asked to 'e back with facts'. So here you go.

If I make a POST request where the content-type is not set in the request header, the variable $_POST remains empty.

Question: How can I force PHP to fill $_POST?

I encountered the problem making an Javascript AJAX request using XDomainRequest where you can not define any headers. Just to make it easier for you to understand the problem you can simulate the same effect without Javascript in PHP this way:

$data = 'test=1';

$fp = fsockopen('www.yourpage', 80, $errno, $errstr, 5);
fputs($fp, "POST /test_out.php HTTP/1.1\r\n");
fputs($fp, "Host: www.yourpage\r\n");
//fputs($fp, "Content-type: application/x-www-form-urlencoded\r\n");
fputs($fp, "Content-length: ". strlen($data) ."\r\n");
fputs($fp, "Connection: close\r\n\r\n");
fputs($fp, $data);

while(!feof($fp)) { echo fgets($fp, 128); }
fclose($fp);

test_out.php would be

var_dump($_POST);

Without the correct content-type the variables in $_POST magically disappear.

This is more an educational question. I am asking this because most people here can not imaging that the content-type has this effect. I was asked to 'e back with facts'. So here you go.

• php
• javascript

Share Improve this question Follow edited Nov 21, 2011 at 15:30 PiTheNumber asked Nov 21, 2011 at 15:13 PiTheNumberPiTheNumber 23.6k1717 gold badges113113 silver badges189189 bronze badges 3

• There's nothing magical about it. That's how PHP works (and any other CGI interpreter for that matter). See php-src/main/rfc1867.c -- Not sure what your question is. Why do you want to omit the required header? – mario Commented Nov 21, 2011 at 15:24
• I don't want to. XDomainRequest does that and there is no way around it because you can not add custom headers. I marked the question with "Question:". – PiTheNumber Commented Nov 21, 2011 at 15:29
• 1 Awesome. Working on a php rest service. Suddenly $_POST disappeared. Yep. No content type. Took forever to figure out how to get $_POST back if we accept unique content types. Many thanks. – Eric G Commented May 31, 2012 at 21:14

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1 Answer 1

Sorted by: Reset to default 8

You can override/inject the necessary header using Apache mod_headers if you have to. Or otherwise resort to manually reconstructing the $_POST array. (See also userland multipart/form-data handler)

If it's always urlencoded, simply read from php://input (Which contains the raw POST request body) and use parse_str:

parse_str(file_get_contents("php://input"), $_POST);

That should recreate the POST array, pretty much like PHP would do.

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