Fix #3327: "Unable to find debug data" when logging objects with circular references

framework/CHANGELOG.md

@@ -23,6 +23,7 @@ Yii Framework 2 Change Log
 - Bug #3236: Return value for DateTime->format('U') casted to double to allow correct date formatting (pgaultier)
 - Bug #3268: Fixed the bug that the schema name in a table name was not respected by `yii\db\mysql\Schema` (terazoid, qiangxue)
 - Bug #3311: Fixed the bug that `yii\di\Container::has()` did not return correct value (mgrechanik, qiangxue)
+- Bug #3327: Fixed "Unable to find debug data" when logging objects with circular references (jarekkozak, samdark)
 - Enh #2264: `CookieCollection::has()` will return false for expired or removed cookies (qiangxue)
 - Enh #2837: Error page now shows arguments in stack trace method calls (samdark)
 - Enh #2906: Added support for using conditional comments for js and css files registered through asset bundles and Html helper (exromany, qiangxue)

framework/log/Target.php

@@ -10,6 +10,7 @@ namespace yii\log;
 use Yii;
 use yii\base\Component;
 use yii\base\InvalidConfigException;
+use yii\helpers\VarDumper;
 use yii\web\Request;
 
 /**
@@ -115,7 +116,7 @@ abstract class Target extends Component
         $context = [];
         foreach ($this->logVars as $name) {
             if (!empty($GLOBALS[$name])) {
-                $context[] = "\${$name} = " . var_export($GLOBALS[$name], true);
+                $context[] = "\${$name} = " . VarDumper::dumpAsString($GLOBALS[$name]);
             }
         }