Receive JSON POST with PHP

Question

I   m trying to receive a JSON POST on a payment interface website  but I can   t decode it   When I print    echo   POST    I get   Array   I get nothing when I try this   if     POST         foreach     POST as  key   gt   value             echo  llave     key  - Valor    value   lt br   gt              I get nothing when I try this    string     POST  operation     var   json decode  string   echo  var    I get NULL when I try this    data   json decode  file get contents  php   input      var dump   data- gt operation      When I do    data   json decode file get contents  php   input    true   var dump  data     I get   NULL   The JSON format is  according to payment site documentation          operacion             tok     generated token            shop id    12313           respuesta    S           respuesta details    respuesta S           extended respuesta description    respuesta extendida           moneda    PYG           monto    10100 00           authorization number    123456           ticket number    123456789123456           response code    00           response description    Transacci  n aprobada            security information                 customer ip    123 123 123 123               card source    I               card country    Croacia               version    0 3               risk index    0                     The payment site log says everything is OK  What   s the problem

User · Answer

Use  HTTP RAW POST DATA instead of   POST    It will give you POST data as is    You will be able to decode it using json decode   later

User · Answer

Read the doc      In general  php   input should be used instead of  HTTP RAW POST DATA    as in the php Manual

User · Answer

It is worth pointing out that if you use json decode file get contents  php   input     as others have mentioned   this will fail if the string is not valid JSON   This can be simply resolved by first checking if the JSON is valid  i e   function isValidJSON  str       json decode  str      return json last error      JSON ERROR NONE      json params   file get contents  php   input     if  strlen  json params   gt  0  amp  amp  isValidJSON  json params      decoded params   json decode  json params     Edit  Note that removing strlen  json params  above may result in subtle errors  as json last error   does not change when null or a blank string is passed  as shown here  http   ideone com va3u8U

User · Answer

data   file get contents  php   input    echo  data    This worked for me

User · Answer

Try    data   json decode file get contents  php   input    true   print r  data   echo  data  operacion      From your json and your code  it looks like you have spelled the word operation correctly on your end  but it isn t in the json   EDIT  Maybe also worth trying to echo the json string from php   input   echo file get contents  php   input

User · Answer

I d like to post an answer that also uses curl to get the contents  and mpdf to save the results to a pdf  so you get all the steps of a tipical use case  It s only raw code  so to be adapted to your needs   but it works      import mpdf somewhere require once dirname   FILE        mpdf vendor autoload php       get mpdf instance  mpdf   new  Mpdf Mpdf        src php file  mysrcfile    http   www somesite com somedir mysrcfile php      where we want to save the pdf  mydestination    http   www somesite com somedir mypdffile pdf       encode   POST data to json  json   json encode   POST       init curl  gt  pass the url of the php file we want to pass     data to and then print out to pdf  ch   curl init  mysrcfile       tell not to echo the results curl setopt   ch  CURLOPT RETURNTRANSFER  1        set the proper headers curl setopt  ch  CURLOPT HTTPHEADER     Content-Type  application json    Content-Length      strlen  json          pass the json data to  mysrcfile curl setopt  ch  CURLOPT POSTFIELDS   json       exec curl and save results  html   curl exec  ch    curl close  ch       parse html and then save to a pdf file  mpdf- gt WriteHTML  html    this- gt mpdf- gt Output  mydestination   Mpdf Output Destination  FILE     In  mysrcfile I ll read json data like this  as stated on previous answers     data   json decode file get contents  php   input         then process it and build the page source

User · Answer

Quite late  It seems   OP  had already tried all the answers given to him  Still if you  OP  were not receiving what had been passed to the  quot  PHP quot  file  error could be  incorrect URL  Check whether you are calling the correct  quot  PHP quot  file   spelling mistake or capital letter in URL  and most important Check whether your URL has  quot s quot   secure  after  quot http quot   Example   quot http   yourdomain com read result php quot   should be  quot https   yourdomain com read result php quot   or either way  add or remove the  quot s quot  to match your URL

User · Answer

If you already have your parameters set like   POST  eg   for example and you don t wish to change it  simply do it like this     POST   json decode file get contents  php   input    true     This will save you the hassle of changing all   POST to something else and allow you to still make normal post requests if you wish to take this line out

[php] Receive JSON POST with PHP

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