How do I make an asynchronous GET request in PHP

Question

I wish to make a simple GET request to another script on a different server   How do I do this   In one case  I just need to request an external script without the need for any output   make request  http   www externalsite com script1 php variable 45      example usage   In the second case  I need to get the text output    output   make request  http   www externalsite com script2 php variable 45    echo  output    string output   To be honest  I do not want to mess around with CURL as this isn t really the job of CURL  I also do not want to make use of http get as I do not have the PECL extensions   Would fsockopen work  If so  how do I do this without reading in the contents of the file  Is there no other way   Thanks all  Update  I should of added  in the first case  I do not want to wait for the script to return anything  As I understand file get contents   will wait for the page to load fully etc

User · Answer

Interesting problem  I m guessing you just want to trigger some process or action on the other server  but don t care what the results are and want your script to continue  There is probably something in cURL that can make this happen  but you may want to consider using exec   to run another script on the server that does the call if cURL can t do it   Typically people want the results of the script call so I m not sure if PHP has the ability to just trigger the process   With exec   you could run a wget or even another PHP script that makes the request with file get conents

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Here is my own PHP function when I do POST to a specific URL of any page      Sample    usage of my Function      lt  php     parse str  email myemail ehehehahaha com amp subject this is just a test          POST  email    email        POST  subject    subject      echo HTTP Post  http   example com mail php    POST           exit    gt   lt  php               HTTP POST using FSOCKOPEN                        by ArbZ      function HTTP Post  URL  data   referrer               parsing the given URL      URL Info parse url  URL           Building referrer     if  referrer         if not given use this script as referrer        referrer   SERVER  SCRIPT URI            making string from  data     foreach  data as  key  gt  value         values     key   urlencode  value        data string implode   amp    values           Find out which port is needed - if not given use standard   80      if  isset  URL Info  port            URL Info  port   80          building POST-request  HTTP HEADERs      request   POST    URL Info  path     HTTP 1 1 n        request   Host     URL Info  host     n        request   Referer   referer n        request   Content-type  application x-www-form-urlencoded n        request   Content-length    strlen  data string    n        request   Connection  close n        request    n        request   data string   n         fp   fsockopen  URL Info  host    URL Info  port         fputs  fp   request       while  feof  fp              result    fgets  fp  128             fclose  fp      eco   nl2br         function getTextBetweenTags  string   tagname             pattern      lt  tagname     gt      lt    tagname gt             preg match  pattern   string   matches           return  matches 1           STORE THE FETCHED CONTENTS to a VARIABLE  because its way better and fast         str    result       txt   getTextBetweenTags  str   span     eco    txt    result   explode   amp    result       return  result 1    lt span style background-color LightYellow color blue gt   trim   GET  em      lt  span gt   lt  pre gt         lt  pre gt

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This is how to make Marquis  answer work with both POST and GET requests         type must equal  GET  or  POST    function curl request async  url   params   type  POST             foreach   params as  key   gt   amp  val            if  is array  val    val   implode       val            post params      key     urlencode  val                  post string   implode   amp     post params           parts parse url  url           fp   fsockopen  parts  host              isset  parts  port     parts  port   80             errno   errstr  30             Data goes in the path for a GET request       if  GET      type   parts  path           post string          out     type    parts  path     HTTP 1 1 r n          out    Host     parts  host     r n          out    Content-Type  application x-www-form-urlencoded r n          out    Content-Length    strlen  post string    r n          out    Connection  Close r n r n            Data goes in the request body for a POST request       if   POST      type  amp  amp  isset  post string    out    post string         fwrite  fp   out         fclose  fp

User · Answer

file get contents will do what you want   output   file get contents  http   www example com     echo  output    Edit  One way to fire off a GET request and return immediately   Quoted from http   petewarden typepad com searchbrowser 2008 06 how-to-post-an html  function curl post async  url   params        foreach   params as  key   gt   amp  val          if  is array  val    val   implode       val            post params      key     urlencode  val              post string   implode   amp     post params         parts parse url  url         fp   fsockopen  parts  host            isset  parts  port     parts  port   80           errno   errstr  30         out    POST    parts  path     HTTP 1 1 r n        out    Host     parts  host     r n        out    Content-Type  application x-www-form-urlencoded r n        out    Content-Length    strlen  post string    r n        out    Connection  Close r n r n       if  isset  post string    out    post string       fwrite  fp   out       fclose  fp       What this does is open a socket  fire off a get request  and immediately close the socket and return

User · Answer

You don t  While PHP offers lots of ways to call a URL  it doesn t offer out of the box support for doing any kind of asynchronous threaded processing per request execution cycle   Any method of sending a request for a URL  or a SQL statement  or a etc   is going to wait for some kind of response   You ll need some kind of secondary system running on the local machine to achieve this  google around for  php job queue

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Suggestion  format a FRAMESET HTML page which contains  let  s say  9 frames inside  Each frame will GET a different  instance  of your myapp php page  There will be 9 different threads running on the Web server  in parallel

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I would recommend you well tested PHP library  curl-easy   lt  php  request   new cURL Request  http   www externalsite com script2 php variable 45     request- gt getOptions       - gt set CURLOPT TIMEOUT  5      - gt set CURLOPT RETURNTRANSFER  true       add callback when the request will be completed  request- gt addListener  complete   function  cURL Event  event         response    event- gt response       content    response- gt getContent        echo  content       while   request- gt socketPerform             do anything else when the request is processed

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I found this interesting link to do asynchronous processing get request    askapache  Furthermore you could do asynchronous processing by using a message queue like for instance beanstalkd

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If you are using Linux environment then you can use the PHP s exec command to invoke the linux curl  Here is a sample code  which will make a Asynchronous HTTP post    function  async http post  url   json string       run    curl -X POST -H  Content-Type  application json       run     -d      json string                url           run      gt   dev null 2 gt  amp 1  amp      exec  run   output   exit     return  exit    0      This code does not need any extra PHP libs and it can complete the http post in less than 10 milliseconds

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Nobody seems to mention Guzzle  which is a PHP HTTP client that makes it easy to send HTTP requests  It can work with or without Curl  It can send both synchronous and asynchronous requests    client   new GuzzleHttp Client     promise    client- gt requestAsync  GET    http   httpbin org get     promise- gt then      function  ResponseInterface  res            echo  res- gt getStatusCode       n              function  RequestException  e            echo  e- gt getMessage       n           echo  e- gt getRequest  - gt getMethod

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You d better consider using Message Queues instead of advised methods  I m sure this will be better solution  although it requires a little more job than just sending a request

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let me show you my way     needs nodejs installed on the server   my server sends 1000 https get request takes only 2 seconds   url php      lt    urls   array fill 0  100   http   google com blank html     function execinbackground  cmd         if  substr php uname    0  7      Windows             pclose popen  start  B     cmd   r                  else            exec  cmd      gt   dev null  amp                  fwite fopen  urls txt   w   implode   n   urls   execinbackground  nodejs urlscript js urls txt         do your work while get requests being executed       gt    urlscript js    var https   require  https    var url   require  url    var http   require  http    var fs   require  fs    var dosya   process argv 2   var logdosya    log txt   var count 0  http globalAgent maxSockets   300  https globalAgent maxSockets   300   setTimeout timeout 100000      maximum execution time  in ms   function trim string        return string replace    s   s   g         fs readFile process argv 2    utf8   function  err  data        if  err            throw err            parcala data        function parcala data        var data   data split   n        count    data length  -  data 1       data forEach function  d            req trim d                       fs unlink dosya  function d             console log   lt  s gt  file deleted   dosya                      function req link        var linkinfo   url parse link       if  linkinfo protocol     https              var options             host  linkinfo host          port  443          path  linkinfo path          method   GET         https get options  function res   res on  data   function d         on  error   function e   console error e            else       var options             host  linkinfo host          port  80          path  linkinfo path          method   GET                 http get options  function res   res on  data   function d         on  error   function e   console error e                process on  exit   onExit    function onExit         log       function timeout     console log  i am too far gone   process exit       function log          var fd   fs openSync logdosya   a         fs writeSync fd  dosya    -  count   n        fs closeSync fd

User · Answer

For me the question about asynchronous GET request is appeared because of I met with situation when I need to do hundreds of requests  get and deal with result data on every request and every request takes significant milliseconds of executing that leads to minutes    of total executing with simple file get contents   In this case it was very helpful comment of w haigh at php net on function http   php net manual en function curl-multi-init php  So  here is my upgraded and cleaned version of making lot of requests simultaneously  For my case it s equivalent to  asynchronous  way  May be it helps for someone      Build the multi-curl handle  adding both  ch  mh   curl multi init        Build the individual requests  but do not execute them  chs        chs  ID0001     curl init  http   webservice example com  method say amp word Hello     chs  ID0002     curl init  http   webservice example com  method say amp word World        chs         foreach   chs as  ch        curl setopt array  ch            CURLOPT RETURNTRANSFER   gt  true      Return requested content as string         CURLOPT HEADER   gt  false             Don t save returned headers to result         CURLOPT CONNECTTIMEOUT   gt  10        Max seconds wait for connect         CURLOPT TIMEOUT   gt  20               Max seconds on all of request         CURLOPT USERAGENT   gt   Robot YetAnotherRobo 1 0                   Well  with a little more of code you can use POST queries too        Also  useful options above can be  CURLOPT SSL VERIFYHOST   gt  0          and  CURLOPT SSL VERIFYPEER   gt  false             Add every  ch to the multi-curl handle     curl multi add handle  mh   ch         Execute all of queries simultaneously  and continue when ALL OF THEM are complete  running   null  do       curl multi exec  mh   running     while   running       Close the handles foreach   chs as  ch        curl multi remove handle  mh   ch     curl multi close  mh       All of our requests are done  we can now access the results    With a help of ids we can understand what response was given    on every concrete our request  responses       foreach   chs as  id   gt   ch         responses  id    curl multi getcontent  ch       curl close  ch     unset  chs      Finita  no more need any curls  -   print r  responses      output results   It s easy to rewrite this to handle POST or other types of HTTP S  requests or any combinations of them  And Cookie support  redirects  http-auth  etc

User · Answer

function make request  url   waitResult true        cmi   curl multi init          curl   curl init        curl setopt  curl  CURLOPT URL   url       curl setopt  curl  CURLOPT RETURNTRANSFER  true        curl multi add handle  cmi   curl         running   null      do           curl multi exec  cmi   running           sleep  1           if   waitResult          break        while   running  gt  0       curl multi remove handle  cmi   curl       if  waitResult            curlInfos   curl getinfo  curl           if  int   curlInfos  http code      200               curl multi close  cmi               return curl multi getcontent  curl                       curl multi close  cmi

User · Answer

This works fine for me  sadly you cannot retrieve the response from your request    lt  php header  http   mahwebsite net myapp php var dsafs      gt    It works very fast  no need for raw tcp sockets

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Here s an adaptation of the accepted answer for performing a simple GET request   One thing to note if the server does any url rewriting  this will not work   You ll need to use a more full featured http client               Performs an async get request  doesn t wait for response       Note  One limitation of this approach is it will not work if server does any URL rewriting         function async get  url             parts parse url  url           fp   fsockopen  parts  host              isset  parts  port     parts  port   80             errno   errstr  30           out    GET    parts  path     HTTP 1 1 r n          out    Host     parts  host     r n          out    Connection  Close r n r n         fwrite  fp   out         fclose  fp

User · Answer

Based on this thread I made this for my codeigniter project  It works just fine  You can have any function processed in the background   A controller that accepts the async calls   class Daemon extends CI Controller          Remember to disable CI s csrf-checks for this controller      function index                  ignore user abort  1            try                       if   strcmp    SERVER  REMOTE ADDR      SERVER  SERVER ADDR        0  amp  amp   in array    SERVER  REMOTE ADDR     this- gt config- gt item   proxy ips                                      log message   error    Daemon called from untrusted IP-address        SERVER  REMOTE ADDR                      show 404    daemon                     return                              this- gt load- gt library   encrypt                  params   unserialize  urldecode   this- gt encrypt- gt decode    POST  data                      unset    POST                 model   array shift   params                 method   array shift   params                 this- gt load- gt model   model                if   call user func array  array   this- gt  model   method     params       FALSE                                 log message   error    Daemon could not call       model           method                                           catch Exception  e                        log message   error    Daemon has error       e- gt getMessage       e- gt getFile       e- gt getLine                           And a library that does the async calls  class Daemon       public function execute background     model  method  params                     ci    amp get instance                The callback URL  its ourselves           parts   parse url   ci- gt config- gt item   base url        daemon             if   strcmp   parts  scheme     https       0                          port   443               host    ssl        parts  host                      else                         port   80               host    parts  host                      if      fp   fsockopen   host  isset   parts  port        parts  port      port   errno   errstr  30         FALSE                         throw new Exception   Internal server error  background process could not be started                        ci- gt load- gt library   encrypt              post string    data     urlencode   ci- gt encrypt- gt encode  serialize  func get args                    out    POST      parts  path       HTTP 1 1 r n            out     Host       host     r n            out     Content-Type  application x-www-form-urlencoded r n            out     Content-Length      strlen   post string       r n            out     Connection  Close r n r n            out     post string          fwrite   fp   out            fclose   fp              This method can be called to process any model  method   in the  background   It uses variable arguments    this- gt load- gt library  daemon     this- gt daemon- gt execute background   model    method    arg1   arg2

User · Answer

Regarding your update  about not wanting to wait for the full page to load - I think a HTTP HEAD request is what you re looking for    get headers should do this - I think it only requests the headers  so will not be sent the full page content    PHP   Curl  HEAD Request takes a long time on some sites  describes how to do a HEAD request using PHP Curl  If you want to trigger the request  and not hold up the script at all  there are a few ways  of varying complexities     Execute the HTTP request as a background process  php execute a background process - basically you would execute something like  wget -O  dev null  carefully escaped url  - this will be platform specific  and you have to be really careful about escaping parameters to the command Executing a PHP script in the background - basically the same as the UNIX process method  but executing a PHP script rather than a shell command Have a  job queue   using a database  or something like beanstalkd which is likely overkill   You add a URL to the queue  and a background process or cron-job routinely checks for new jobs and performs requests on the URL

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Just a few corrections on scripts posted above  The following is working for me  function curl request async  url   params   type  GET                  post params   array            foreach   params as  key   gt   amp  val                if  is array  val    val   implode       val                post params      key     urlencode  val                      post string   implode   amp     post params             parts parse url  url           echo print r  parts  TRUE            fp   fsockopen  parts  host                 isset  parts  scheme     amp  amp   parts  scheme       https    443   80               errno   errstr  30             out     type    parts  path      isset  parts  query           parts  query            HTTP 1 1 r n            out    Host     parts  host     r n            out    Content-Type  application x-www-form-urlencoded r n            out    Content-Length    strlen  post string    r n            out    Connection  Close r n r n              Data goes in the request body for a POST request         if   POST      type  amp  amp  isset  post string    out    post string          fwrite  fp   out           fclose  fp

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For PHP5 5   mpyw co is the ultimate solution  It works as if it is tj co in JavaScript   Example  Assume that you want to download specified multiple GitHub users  avatars  The following steps are required for each user    Get content of http   github com mpyw  GET HTML  Find  lt img class  avatar  src       gt  and request it  GET IMAGE    ---  Waiting my response      Waiting other response in parallel flows  Many famous curl multi based scripts already provide us the following flows            -----------GET HTML    --GET IMAGE                                                                    Start  GET HTML              ----------------GET IMAGE  Finish                                                                  -----GET HTML          -----GET IMAGE          However  this is not efficient enough  Do you want to reduce worthless waiting times                -----------GET HTML--GET IMAGE                                                         Start  GET HTML----------------GET IMAGE  Finish                                                     -----GET HTML-----GET IMAGE       Yes  it s very easy with mpyw co  For more details  visit the repository page

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Try this code       chu   curl init     curl setopt  chu  CURLOPT URL   http   www myapp com test php someprm xyz     curl setopt  chu  CURLOPT FRESH CONNECT  true   curl setopt  chu  CURLOPT TIMEOUT  1    curl exec  chu   curl close  chu     Please dont forget to enable CURL php extension

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Try     Your Code here  pid   pcntl fork    if   pid    -1         die  could not fork      else if   pid    echo  Bye       else          Do Post Processing     This will NOT work as an apache module  you need to be using CGI

[php] How do I make an asynchronous GET request in PHP?

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