PHP POST method_PHP tutorial

Compare the differences between form POST and fsockopen submission methods.

When the form is submitted via POST

$_POST and php://input can get the value, $HTTP_RAW_POST_DATA is empty
$_POST organizes the submitted data in an associative array, and performs encoding processing on it, such as urldecode, and even encoding conversion.
php://input can obtain unprocessed POST raw data through file reading through the input stream

php://input allows reading the raw data of POST. It puts less pressure on memory than $HTTP_RAW_POST_DATA and does not require any special php.ini settings. php://input cannot be used with enctype="multipart/form-data".

fsockopen submits POST data
Example:

$sock = fsockopen("localhost", 80, $errno, $errstr, 30);
if (!$sock) die("$errstr ($errno) ");
$data = "txt=" . urlencode("中") . "&bar=" . urlencode("Value for Bar");
fwrite($sock, "POST /posttest/response. php HTTP/1.0 ");
fwrite($sock, "Host: localhost ");
fwrite($sock, "Content-type: application/x-www-form-urlencoded ");
fwrite($sock, "Content-length: " . strlen($data) . " ");
fwrite($sock, "Accept: */* ");
fwrite($sock, " ");
fwrite($sock, "$data ");
fwrite($sock, " ");
$headers = "";
while ($str = trim(fgets($sock, 4096)))
$headers .= "$str ";
echo " ";
$body = "";
while (!feof($sock))
$body .= fgets($sock, 4096);
fclose($sock);
echo $body;

Consistent with the result (1)

Conclusion:
1. Use php://input to easily get the original POST data

2. $HTTP_RAW_POST_DATA is only valid when the Content-Type type of POST is not recognized by PHP

POST data usually submitted through page forms cannot be extracted through $HTTP_RAW_POST_DATA. Its encoding type attribute (enctype attribute) is application/x-www-form-urlencoded, multipart/form-data.

Note: Even if you explicitly change the enctype attribute in the page to a type that is not recognized by PHP, it will still be invalid.
Since the form submission encoding attribute is form-limited, unrecognizable types will be considered to be submitted in the default encoding (i.e. application/x-www-form-urlencoded)

3. $_POST can only be obtained when the data is submitted by application/x-www-form-urlencoded type.

http://www.bkjia.com/PHPjc/508353.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/508353.htmlTechArticleCompare the differences between form POST and fsockopen submission. When the form is submitted in POST mode, $_POST and php://input can get the value, and $HTTP_RAW_POST_DATA is empty. $_POST uses the associated number...