Usage analysis of php input stream php input

When making a function to take pictures with a camera and upload them, use php://input in php to get the content. So I learned about php://input.

From the official website information, php://input is a read-only information flow. When the request method is post and enctype is not equal to "multipart/form-data", you can use php://input to obtain the original Requested data.

Look at a simple example.

The client is just a form, very simple.

<form action="" method="POST">
    name: <input type="text" name="name" value="tom" /><br />
    age:<input type="text" name="age" value="22" /><br />
    <input type="submit" value="Submit" />
</form>

Submit the form to the server, and the server uses file_get_contents to obtain the content of php://input

$content = file_get_contents("php://input");
echo $content; // 输出name=tom&age=22

In the description of php://input on the official website, the variable $HTTP_RAW_POST_DATA is repeatedly mentioned. This variable is actually the same as file_get_contents The content of (php://input) is the same. If you want to enable this variable, you need to modify the configuration file, find the option always_populate_raw_post_data, set it to On, and then restart the web server. That's it. Using php://input does not require modifying the php configuration file.

In project applications, such as taking photos with the camera, uploading and saving, you can use php://input. After the client takes a photo, it sends the image stream to the server. The server uses file_get_getcontents('php://input') to get the image stream, and then saves the image stream to a file. This file is the image.