title: php use the exec() return 127
body: <p>I would like to execute a statement on my website, the server environment is LNMP, the single always return 127, can not be executed.</p>
  
  <hr>
  
  <pre><code>$dir = 'php /alidata/www/index.php gitblog exportsite';
  exec("$dir",$output,$is_success);
  print_r($output);
  echo"&lt;br&gt;";
  echo $is_success;
  echo"&lt;br&gt;";
  </code></pre>