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A brief discussion on how PHP receives POST data, a brief discussion on how PHP receives post_PHP tutorial
- WBOYOriginal
- 2016-07-13 09:51:44909browse
A brief discussion on how PHP receives POST data, a brief discussion on how PHP receives post
Usually users use browser web forms to submit data to the server post, we use PHP to receive user POST to server data and process it appropriately. But in some cases, if the user uses client software to send post data to the server PHP program and cannot use $_POST to identify it, how should it be handled?
$_POST method to receive data
The $_POST method is an array of variables passed through the HTTP POST method, which is an automatic global variable. For example, if you use $_POST['name'], you can receive data posted from web forms and web pages asynchronously. That is, $_POST can only receive data submitted with the document type Content-Type: application/x-www-form-urlencoded.
Receive data via $GLOBALS['HTTP_RAW_POST_DATA']
If the data posted is not a document type that PHP can recognize, such as text/xml or soap, etc., we can use $GLOBALS['HTTP_RAW_POST_DATA'] to receive it. The $HTTP_RAW_POST_DATA variable contains the raw POST data. This variable is generated only when data of unrecognized MIME types is encountered. $HTTP_RAW_POST_DATA is not available for enctype="multipart/form-data" form data. In other words, using $HTTP_RAW_POST_DATA cannot receive data posted from web forms.
php://input method to receive data
If a better way to access the raw POST data is php://input. php://input allows reading the raw data of a POST. It puts less pressure on memory than $HTTP_RAW_POST_DATA and does not require any special php.ini settings, while php://input cannot be used with enctype="multipart/form-data".
For example, the user uses a client application to post a file to the server. We don’t care about the content of the file, but we want to save the file completely on the server. We can use the following code:
$input = file_get_contents('php://input');
file_put_contents($original, $input); //$original为服务器上的文件
The above code uses file_get_contents('php://input') to receive post data, and then writes the data into the $original file. In fact, it can be understood as uploading a file from the client to the server. There are many such applications , especially when our PHP development needs to jointly develop products with C, C and other application development.
The following is a small example that demonstrates three different ways of receiving POST data processing: $_POST, $GLOBALS['HTTP_RAW_POST_DATA'] and php://input:
a.html
<form name="demo_form" action="post.php" method="post"> <p><label>Name: </label><input type="text" class="input" name="name"></p> <p><label>Address: </label><input type="text" class="input" name="address"></p> <p><input type="submit" name="submit" class="btn" value="Submit"></p> </form>
post.php
header("Content-type:text/html;charset=utf-8");
echo '$_POST接收:<br/>';
print_r($_POST);
echo '<hr/>';
echo '$GLOBALS[\'HTTP_RAW_POST_DATA\']接收:<br/>';
print_r($GLOBALS['HTTP_RAW_POST_DATA']);
echo '<hr/>';
echo 'php://input接收:<br/>';
$data = file_get_contents('php://input');
print_r(urldecode($data));
The above is the entire content of this article. I hope you can understand the three ways in which PHP receives post data.