Returning JSON from a PHP Script

Question

I want to return JSON from a PHP script   Do I just echo the result  Do I have to set the Content-Type header

User · Answer

An easy way to format your domain objects to JSON is to use the Marshal Serializer. Then pass the data to json_encode and send the correct Content-Type header for your needs. If you are using a framework like Symfony, you don't need to take care of setting the headers manually. There you can use the JsonResponse.

For example the correct Content-Type for dealing with Javascript would be application/javascript.

Or if you need to support some pretty old browsers the safest would be text/javascript.

For all other purposes like a mobile app use application/json as the Content-Type.

Here is a small example:

<?php
...
$userCollection = [$user1, $user2, $user3];

$data = Marshal::serializeCollectionCallable(function (User $user) {
    return [
        'username' => $user->getUsername(),
        'email'    => $user->getEmail(),
        'birthday' => $user->getBirthday()->format('Y-m-d'),
        'followers => count($user->getFollowers()),
    ];
}, $userCollection);

header('Content-Type: application/json');
echo json_encode($data);

User · Answer

lt  php  data       whatever you re serializing      header  Content-type  application json  charset utf-8    echo json encode  data     gt

User · Answer

The answer to your question is here   It says      The MIME media type for JSON text is   application json    so if you set the header to that type  and output your JSON string  it should work

User · Answer

This question got many answers but none cover the entire process to return clean JSON with everything required to prevent the JSON response to be malformed         returnJsonHttpResponse     param  success  Boolean     param  data  Object or Array     function returnJsonHttpResponse  success   data           remove any string that could create an invalid JSON         such as PHP Notice  Warning  logs        ob clean            this will clean up any previously added headers  to start clean     header remove             Set the content type to JSON and charset          charset can be set to something else      header  quot Content-type  application json  charset utf-8 quot            Set your HTTP response code  2xx   SUCCESS          anything else will be error  refer to HTTP documentation     if   success            http response code 200         else           http response code 500                     encode your PHP Object or Array into a JSON string         stdClass or array     echo json encode  data           making sure nothing is added     exit        References  response remove ob clean Content-type JSON HTTP Codes http response code json encode

User · Answer

Set the content type with header  Content-type  application json    and then echo your data

User · Answer

If you need to get json from php sending custom information you can add this header  Content-Type  application json    before to print any other thing  So then you can print you custome echo    monto       monto 0 - gt valor     moneda      moneda 0 - gt nombre     simbolo      moneda 0 - gt simbolo

User · Answer

A simple function to return a JSON response with the HTTP status code   function json response  data null   httpStatus 200        header remove         header  Content-Type  application json         http response code  httpStatus        echo json encode  data        exit

User · Answer

In case you re doing this in WordPress  then there is a simple solution  add action   parse request   function   wp         data      Your data to serialise         wp send json success  data      Returns the data with a success flag         exit       Prevents more response from the server         Note that this is not in the wp head hook  which will always return most of the head  even if you exit immediately  The parse request comes a lot earlier in the sequence

User · Answer

Try json encode to encode the data and set the content-type with header  Content-type  application json

User · Answer

This is a simple PHP script to return male female and user id as json value will be any random value as you call the script json php    Hope this  help thanks   lt  php header  Content-type  application json     myObj new  stdClass     myObj- gt user id   rand 0  10    myObj- gt male   rand 0  5    myObj- gt female   rand 0  5    myJSON   json encode  myObj   echo  myJSON    gt

User · Answer

As said above    header  Content-Type  application json      will make the job  but keep in mind that     Ajax will have no problem to read json even if this header is not used  except if your json contains some HTML tags  In this case you need to set the header as application json  Make sure your file is not encoded in UTF8-BOM  This format add a character in the top of the file  so your header   call will fail

User · Answer

It is also good to set the access security - just replace   with the domain you want to be able to reach it     lt  php header  Access-Control-Allow-Origin       header  Content-type  application json         response   array         response 0    array           id    gt   1            value1   gt   value1            value2   gt   value2          echo json encode  response      gt    Here is more samples on that  how to bypass Access-Control-Allow-Origin

User · Answer

If you query a database and need the result set in JSON format it can be done like this    lt  php   db   mysqli connect  localhost   root      mylogs      MSG  query    SELECT   FROM logs LIMIT 20    result   mysqli query  db   query     Add all records to an array  rows   array    while  row    result- gt fetch array          rows      row      Return result to jTable  qryResult   array     qryResult  logs      rows  echo json encode  qryResult    mysqli close  db      gt    For help in parsing the result using jQuery take a look at this tutorial

User · Answer

You can use this little PHP library  It sends the headers and give you an object to use it easily   It looks like      lt  php    Include the json class include  includes json php        Then create the PHP-Json Object to suits your needs     Set a variable   var name       Json   new json  var    name        Fire a callback   callback       Json   new json  callback    name        Just send a raw JSON       Json   new json        Build data  object   new stdClass     object- gt test    OK    arraytest   array  1   2   3     jsonOnly      Hello     darling         Add some content  Json- gt add  width    565px     Json- gt add  You are logged IN     Json- gt add  An Object    object    Json- gt add  An Array   arraytest    Json- gt add  A Json   jsonOnly       Finally  send the JSON    Json- gt send      gt

User · Answer

A complete piece of nice and clear PHP code returning JSON is    option     GET  option     if    option    1          data      a    b    c            will encode to JSON array    a   b   c          accessed as example in JavaScript like  result 1   returns  b     else        data      name    gt   God    age    gt  -1           will encode to JSON object    name   God   age  -1           accessed as example in JavaScript like  result name or result  name    returns  God      header  Content-type  application json    echo json encode   data

User · Answer

While you re usually fine without it  you can and should set the Content-Type header   lt  php  data       whatever you re serializing      header  Content-Type  application json    echo json encode  data    If I m not using a particular framework  I usually allow some request params to modify the output behavior   It can be useful  generally for quick troubleshooting  to not send a header  or sometimes print r the data payload to eyeball it  though in most cases  it shouldn t be necessary

User · Answer

Yeah  you ll need to use echo to display output  Mimetype  application json

User · Answer

Whenever you are trying to return JSON response for API or else make sure you have proper headers and also make sure you return a valid JSON data   Here is the sample script which helps you to return JSON response from PHP array or  from JSON file      PHP Script  Code      lt  php     Set required headers header  Content-Type  application json  charset utf-8    header  Access-Control-Allow-Origin               Example  First       Get JSON data from JSON file and retun as JSON response         Get JSON data from JSON file  json   file get contents  response json        Output  response echo  json                                                                      Example  Second       Build JSON data from PHP array and retun as JSON response         Or build JSON data from array  PHP   json var        hashtag    gt   HealthMatters      id    gt   072b3d65-9168-49fd-a1c1-a4700fc017e0      sentiment    gt         negative    gt  44       positive    gt  56          total    gt   3400      users    gt                 profile image url    gt   http   a2 twimg com profile images 1285770264 PGP normal jpg          screen name    gt   rayalrumbel          text    gt   Tweet  A    HealthMatters because life is cool    We love this life and want to spend more           timestamp    gt      timestamp                         profile image url    gt   http   a2 twimg com profile images 1285770264 PGP normal jpg          screen name    gt   mikedingdong          text    gt   Tweet  B    HealthMatters because life is cool    We love this life and want to spend more           timestamp    gt      timestamp                         profile image url    gt   http   a2 twimg com profile images 1285770264 PGP normal jpg          screen name    gt   ScottMili          text    gt   Tweet  C    HealthMatters because life is cool    We love this life and want to spend more           timestamp    gt      timestamp                         profile image url    gt   http   a2 twimg com profile images 1285770264 PGP normal jpg          screen name    gt   yogibawa          text    gt   Tweet  D    HealthMatters because life is cool    We love this life and want to spend more           timestamp    gt      timestamp                        Output  response echo json encode  json var        JSON File  JSON DATA            hashtag    HealthMatters         id    072b3d65-9168-49fd-a1c1-a4700fc017e0         sentiment              negative   44            positive   56              total    3400         users                            profile image url    http   a2 twimg com profile images 1285770264 PGP normal jpg                 screen name    rayalrumbel                 text    Tweet  A    HealthMatters because life is cool    We love this life and want to spend more                  timestamp       timestamp                                       profile image url    http   a2 twimg com profile images 1285770264 PGP normal jpg                 screen name    mikedingdong                 text    Tweet  B    HealthMatters because life is cool    We love this life and want to spend more                  timestamp       timestamp                                       profile image url    http   a2 twimg com profile images 1285770264 PGP normal jpg                 screen name    ScottMili                 text    Tweet  C    HealthMatters because life is cool    We love this life and want to spend more                  timestamp       timestamp                                       profile image url    http   a2 twimg com profile images 1285770264 PGP normal jpg                 screen name    yogibawa                 text    Tweet  D    HealthMatters because life is cool    We love this life and want to spend more                  timestamp       timestamp                            JSON Screeshot

User · Answer

According to the manual on json encode the method can return a non-string  false       Returns a JSON encoded string on success or FALSE on failure    When this happens echo json encode  data  will output the empty string  which is invalid JSON   json encode will for instance fail  and return false  if its argument contains a non UTF-8 string    This error condition should be captured in PHP  for example like this    lt  php header  Content-Type  application json        Collect what you need in the  data variable    json   json encode  data   if   json     false           Avoid echo of empty string  which is invalid JSON   and        JSONify the error message instead       json   json encode   jsonError    gt  json last error msg          if   json     false               This should not happen  but we go all the way now           json      jsonError   unknown                  Set HTTP response status code to  500 - Internal Server Error     http response code 500     echo  json    gt    Then the receiving end should of course be aware that the presence of the jsonError property indicates an error condition  which it should treat accordingly    In production mode it might be better to send only a generic error status to the client and log the more specific error messages for later investigation   Read more about dealing with JSON errors in PHP s Documentation

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