Seldaek · vaishnavyogesh · Jul 13, 2025
diff --git a/src/Monolog/Logger.php b/src/Monolog/Logger.php
@@ -264,6 +264,19 @@ public function pushProcessor(ProcessorInterface|callable $callback): self
         return $this;
     }
 
+    /**
+     * Adds a processor to the bottom of the stack.
+     *
+     * @phpstan-param ProcessorInterface|(callable(LogRecord): LogRecord) $callback
+     * @return $this
+     */
+    public function prependProcessor(ProcessorInterface|callable $callback): self
+    {
+        $this->processors[] = $callback;
+
+        return $this;
+    }
+
     /**
      * Removes the processor on top of the stack and returns it.
      *

diff --git a/tests/Monolog/LoggerTest.php b/tests/Monolog/LoggerTest.php
@@ -257,6 +257,25 @@ public function testPushPopProcessor()
         $logger->popProcessor();
     }
 
+    /**
+     * @covers Logger::prependProcessor
+     */
+    public function testPrependProcessor()
+    {
+        $logger = new Logger(__METHOD__);
+
+        $processor1 = new WebProcessor;
+        $processor2 = new WebProcessor;
+
+        $logger->pushProcessor($processor1);
+        $logger->prependProcessor($processor2);
+
+        $this->assertEquals($processor1, $logger->popProcessor());
+        $this->assertEquals($processor2, $logger->popProcessor());
+
+        $this->assertEmpty($logger->getProcessors());
+    }
+
     /**
      * @covers Logger::addRecord
      */