Error Reporting from your Unity3D game.

This is something I use to capture errors and log-information from games that are out in the wild, and report them back home to my server.

using UnityEngine;
using System.Collections;


public class ErrorReporter : MonoBehaviour
{

 string debugText = "";
 string postURL = "";

 void Awake ()
 {
  Application.RegisterLogCallback (new Application.LogCallback (CaptureLog));
 }

 IEnumerator SendDebugToServer ()
 {
  WWW www = new WWW (postURL, System.Text.ASCIIEncoding.ASCII.GetBytes (debugText));
  yield return www;
 }

 void CaptureLog (string condition, string stacktrace, LogType type)
 {
  string sep = "------------------------------------------------------------------------------\r\n";
  debugText = sep + type.ToString () + " " + Time.realtimeSinceStartup.ToString () + "\r\n" + condition + "\r\n" + stacktrace + debugText;
  if (type == LogType.Exception) {
   StartCoroutine (SendDebugToServer ());
   if (!Application.isEditor) {
    SomethingReallyBadHappened ();
   }
  }
 }

 void SomethingReallyBadHappened ()
 {
  //NB: Try and recover or fail gracefully here.
 }
 
}

On the server side, you could use a very simple piece of PHP to receive the request and write it to a file.

$data = file_get_contents('php://input');
$file = "reports/report_" . time() . ".txt"; 

$fp = fopen($file, "w") or die("Couldn't open $file for writing!");
fwrite($fp, $data) or die("Couldn't write values to file!"); 

fclose($fp); 
echo "Saved to $file successfully!";