PHP receives the request header headers's custom value receives RAW format data in the body

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In app interface development, we often put some device information, or general parameters into the request header, but how do we use PHP to receive these request headers information.
Post Pass value We often use the Form_data type, but if we transmit the data as raw type, $_post is not able to get the value Headers gets the custom value

If the value is DeviceInfo, then the value is $_server[' Http_deviceinfo ']

If the value is Device_info, then the value of the $_server is not received

If the value is Device-info, then the value is $_server[' Http_deviceinfo ']

To sum up, the underlined connection will not receive a value. get the post value of the raw type

Receive method:

       $bodyData = @file_get_contents (' php://input ');
        $bodyData = Json_decode ($bodyData, true);