From cf4240cc511c30a78b0db00c72cf33837b27f52e Mon Sep 17 00:00:00 2001
From: Jordi Boggiano <j.boggiano@seld.be>
Date: Wed, 6 Jul 2011 15:37:29 +0200
Subject: [PATCH] Ensure processors are valid callables

---
 src/Monolog/Handler/AbstractHandler.php | 3 +++
 src/Monolog/Logger.php                  | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/src/Monolog/Handler/AbstractHandler.php b/src/Monolog/Handler/AbstractHandler.php
index 315279c5..6dbf77a7 100644
--- a/src/Monolog/Handler/AbstractHandler.php
+++ b/src/Monolog/Handler/AbstractHandler.php
@@ -73,6 +73,9 @@ abstract class AbstractHandler implements HandlerInterface
      */
     public function pushProcessor($callback)
     {
+        if (!is_callable($callback)) {
+            throw new \InvalidArgumentException('Processors must be valid callables (callback or object with an __invoke method), '.var_export($callback, true).' given');
+        }
         array_unshift($this->processors, $callback);
     }
 
diff --git a/src/Monolog/Logger.php b/src/Monolog/Logger.php
index fd8ee8bd..3afb204f 100644
--- a/src/Monolog/Logger.php
+++ b/src/Monolog/Logger.php
@@ -116,6 +116,9 @@ class Logger
      */
     public function pushProcessor($callback)
     {
+        if (!is_callable($callback)) {
+            throw new \InvalidArgumentException('Processors must be valid callables (callback or object with an __invoke method), '.var_export($callback, true).' given');
+        }
         array_unshift($this->processors, $callback);
     }