Add support for PSR-3 levels to all public APIs accepting levels, fixes #421

src/Monolog/Logger.php

@@ -388,6 +388,21 @@ class Logger implements LoggerInterface
         return static::$levels[$level];
     }
 
+    /**
+     * Converts PSR-3 levels to Monolog ones if necessary
+     *
+     * @param string|int Level number (monolog) or name (PSR-3)
+     * @return int
+     */
+    public static function toMonologLevel($level)
+    {
+        if (is_string($level) && defined(__CLASS__.'::'.strtoupper($level))) {
+            return constant(__CLASS__.'::'.strtoupper($level));
+        }
+
+        return $level;
+    }
+
     /**
      * Checks whether the Logger has a handler that listens on the given level
      *