title: Php check if shell_exec command was successful
body: <p>I basically want to check if a command ran successfully using <code>shell_exec</code>.</p>
  <p>Simple function:</p>
  <pre><code>public static function foo()
  {
      $command = &quot;blabla&quot;;
      shell_exec($command);
  }
  </code></pre>
  <p>Edit, I tried Mister M's suggestion like this:</p>
  <pre><code>foreach($commands as $key =&gt; $value)
  {
      shell_exec($value, $output, $return);
  }
  </code></pre>
  <p>And I get this error:</p>
  <blockquote>
  <p>Undefined variable: output</p>
  </blockquote>