PHP CURL call is displaying NULL all the time -

this question has been asked. of didn't work out me. getting null when curl call made time.

the following list_clients.php file.

<?php  require_once 'init.php'; header('content-type: application/json'); $clientresults  = mysqli_query($link, "select * clients"); $clients        = array(); while($client = mysqli_fetch_assoc($clientresults)){     $clients[] = $client; } echo json_encode($clients); exit; 

so output of above :

[{"ip_address":"192.168.177.137","mac_address":"3a:1a:cf:7c:92:89","added_on":"2017-08-19 12:48:34"},{"ip_address":"192.168.177.137","mac_address":"3a:1a:cf:7c:92:89","added_on":"2017-08-20 08:09:29"}] 

the following curl_call.php file

<?php $url    = 'http://127.0.0.1/testing/list_clients.php'; $curl   = curl_init();  curl_setopt($curl, curlopt_url, $url); curl_setopt($curl, curlopt_returntransfer, true); curl_setopt($curl, curlopt_httpget, true); curl_setopt($curl, curlopt_header, 0); //curl_setopt($curl, curlopt_ssl_verifypeer, false); //curl_setopt($curl, curlopt_ssl_verifyhost, false); curl_setopt($curl, curlopt_httpheader, array(                 'content-type : application/json',                 'accept: application/json'         )); $clientresult   = curl_exec($curl); if($clientresult == false) {     var_dump(curl_error($curl)); } curl_close($curl);  var_dump($clientresult); //for line getting following image eror  $clients        = json_decode($clientresult, true);  var_dump($clients); 

if var_dump($clientresult); getting following error

it's displaying null time. might causing error.

you missing warning being thrown $ch. it's undeclared, yet reference on line 17:

if($clientresult == false) {     var_dump(curl_error($ch)); } 

(as side note, i'd use === false, valid return values cast false don't wrongly trigger code.)

you're carrying on execution after error (failed be) handled. null you're seeing because curl request failed.

correct typo in code , stop (or appropriately) if error thrown:

if($clientresult == false) {     var_dump(curl_error($curl));     exit(); } 

---

update in response op being updated:

the other reason null might returned because response not valid json. check php documentation:

returns value encoded in json in appropriate php type. values true, false , null returned true, false , null respectively. null returned if json cannot decoded or if encoded data deeper recursion limit.

that html output you're debugging shows (in question update) won't parse json.