docker-php · joelwurtz · Feb 17, 2019 · Jun 17, 2018 · Jun 17, 2018
diff --git a/docs/cookbook/container-run.md b/docs/cookbook/container-run.md
@@ -208,3 +208,44 @@ $hostConfig->setPortBindings($portMap);
 
 $containerConfig->setHostConfig($hostConfig);
 ```
+
+## Executing a command on a running container 
+
+This example shows how you can execute an command on any running container. It is same as `docker exec CONTAINER_ID some_command `.
+
+```php
+<?php
+use Docker\Docker;
+use Docker\API\Model\ContainersIdExecPostBody;
+use Docker\API\Model\ExecIdStartPostBody;
+
+$docker = Docker::create();
+
+$execConfig = new ContainersIdExecPostBody();
+$execConfig->setTty(true);
+$execConfig->setAttachStdout(true);
+$execConfig->setAttachStderr(true);
+$execConfig->setCmd(['mkdir', '/tmp/testDir']);
+
+$execid = $docker->containerExec('android',$execConfig)->getId();
+$execStartConfig = new ExecIdStartPostBody();
+$execStartConfig->setDetach(false);
+
+// Execute the command 
+$stream = $docker->execStart($execid,$execStartConfig);
+
+// To see the output stream of the 'exec' command
+$stdoutText = "";
+$stderrText = "";
+
+$stream->onStdout(function ($stdout) use (&$stdoutText) {
+    $stdoutText .= $stdout;
+});
+
+$stream->onStderr(function ($stderr) use (&$stderrText) {
+    $stderrText .= $stderr;
+});
+
+$stream->wait();
+var_dump([ "stdout" => $stdoutText, "stderr" => $stderrText ]) ;
+```