PHP: http raw POST data contain BINARY

Question

i have a device that send POST data to my server. so print_r($_POST) is empty, i can see the data only when i run this

$content = file_get_contents('php://input');
var_dump($content);   

//or i can use:  print_r($content);

i save those to a file and result are some json and BINARY DATA (CHECK IMAGE)

if i add code like this json_decode($content,true); i dont see anything

so how can i decode binary or what can i do to decode the json and also see what data is send in binary?

You need to try and search that input to look for a valid structure. Then parse THAT. Might I recommend this? — Blue
– Blue, Commented Sep 17, 2018 at 0:08
Is there no documentation for this device? What is it supposed to be sending? What is the HTTP request Content-type header? It should be available in $_SERVER['HTTP_CONTENT_TYPE'] — Phil
– Phil, Commented Sep 17, 2018 at 0:11
[Content-Type] => application/octet-stream, application/octet-stream — Ba Ta
– Ba Ta, Commented Sep 17, 2018 at 0:18

q74 · Accepted Answer · 2018-09-17 01:00:23Z

2

If you want to decode binary data inPHP, try the following:

<?php
$binarydata = "\x04\x00\xa0\x00";
$data = unpack('C*', $binarydata);
var_dump($data);

output:

array (size=4)
  1 => int 4
  2 => int 0
  3 => int 160
  4 => int 0

Load your contents from file_get_contents('php://input') to $binarydata and you will get an array of values. You can then apply some logic to extract JSON string and process it.

answered Sep 17, 2018 at 1:00

q74

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2 Comments

Ba Ta Over a year ago

array(125) { [1]=> int(121) [2]=> int(0) [3]=> int(0) [4]=> int(0) [5]=> int(123) [6]=> int(34) [7]=> int(102) ................int(125) [124]=> int(10) [125]=> int(0) } so what to do with those

q74 Over a year ago

these are bytes, which are built from bits (8 bits = 1 byte). For example string "enroll", which is what you will probably be looking for is represented by the following: char 101, 110, 114, 111, 108, 108 ascii e n r o l l

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