Merge pull request #274 in ZP/z-push from...

Merge pull request #274 in ZP/z-push from feature/ZP-958-allow-to-disable-logging-of-certain-error-levels to develop

* commit '36d62f47':
  ZP-958 Remove LOG_ERROR_MASK from config and make it a hidden feature.
  ZP-958 Allow to disable logging of certain error-levels.

src/lib/core/zlog.php

@@ -176,8 +176,13 @@ if (!defined('E_DEPRECATED')) define(E_DEPRECATED, 8192);
 
 // TODO review error handler
 function zpush_error_handler($errno, $errstr, $errfile, $errline, $errcontext) {
-    $bt = debug_backtrace();
+    if (defined('LOG_ERROR_MASK')) $errno &= LOG_ERROR_MASK;
+
     switch ($errno) {
+        case 0:
+            // logging disabled by LOG_ERROR_MASK
+            break;
+
         case E_DEPRECATED:
             // do not handle this message
             break;
@@ -191,6 +196,7 @@ function zpush_error_handler($errno, $errstr, $errfile, $errline, $errcontext) {
             break;
 
         default:
+            $bt = debug_backtrace();
             ZLog::Write(LOGLEVEL_ERROR, "trace error: $errfile:$errline $errstr ($errno) - backtrace: ". (count($bt)-1) . " steps");
             for($i = 1, $bt_length = count($bt); $i < $bt_length; $i++) {
                 $file = $line = "unknown";