ZP-958 Allow to disable logging of certain error-levels.

Released under the Affero GNU General Public License (AGPL) version 3.

src/config.php

@@ -119,6 +119,8 @@
     define('LOGBACKEND', 'filelog');
     define('LOGLEVEL', LOGLEVEL_WBXML);
     define('LOGAUTHFAIL', false);
+    // uncomment to NOT log certain error-levels eg. E_NOTICE or E_STRICT
+    //define('LOG_ERROR_MASK', ~(E_NOTICE|E_STRICT));
 
     // To save e.g. WBXML data only for selected users, add the usernames to the array
     // The data will be saved into a dedicated file per user in the LOGFILEDIR

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";