json - php capture callback responses to file -

i'm using api sms provider (yes, needs provider i'm stuck it), documentation leaves lot desired, , includes examples , support.

i'm trying figure out different callbacks have no idea they're sending back. there way write php script captures incoming responses file. responses (but not exclusively), wanna send couple calls (both correct , errors) , record get.

{    "api_job_id":"4c2478d3-aebb-4510-8720-1b479d01cfd5",    "client_job_id":"abc123456",    "data":[       {          "type":"sms",          "message_id":"14182390945378443202",          "status":"sent",          "timestamp":1422885283,          "micro_timestamp":1422885283477,          "to":"xxxxxxxxx",          "from":"companya",          "client_message_id":"2",          "error_code":0       }    ] } 

this might looking for:

<?php  $logfile = dirname(__file__).'/smscallback.log';  // change if necessary  foreach($_get $key => $value) {     $header = 'callback_key: "' . $key . '", received: ' . gmdate('y-m-d h:i:s') . ' (utc)'. ', contents:' . php_eol;     if (version_compare(php_version, '5.4.0') >= 0) {         $tmparray = (array)json_decode($value);         $json = json_encode($tmparray, json_pretty_print);     } else  {         $json = $value;     }      file_put_contents($logfile, $header . $json. php_eol . php_eol, file_append);     echo "saved file '$logfile'"; }  // http://www.example.com/smscallback.php?callbck1={"api_job_id":"4c2478d3-aebb-4510-8720-1b479d01cfd5","client_job_id":"abc123456","data":[{"type":"sms","message_id":"14182390945378443202","status":"sent","timestamp":1422885283,"micro_timestamp":1422885283477,"to":"xxxxxxxxx","from":"companya","client_message_id":"2","error_code":0}]}  ?> 

the script accepts parameters. writes (appends) key, current date , time (utc) plus values of parameters log file on server.
note: web server must have write privileges log file, of course.