title: what does it mean "(include_path='.:/usr/share/pear:/usr/share/php')"?
body: <p>I have file structure on EC2 like : but facing some file referencing problem.</p>
  
  <pre><code>index.php
  -db
    -config.php
  -cron
    -cron1.php
  </code></pre>
  
  <p>I have tried file referencing as:</p>
  
  <pre><code>`require_once (dirname(__FILE__).'/db/config.php');`
  `require_once (($_SERVER['DOCUMENT_ROOT']).'/db/config.php');`
  </code></pre>
  
  <p>but cron doesn't run.it gives error in mail as </p>
  
  <pre><code>`PHP Warning:  require_once(/db/config.php): failed to open stream: No such file or directory in /var/www/html/cron/cron1.php on line 3
  
  Warning: require_once(/db/config.php): failed to open stream: No such file or directory in /var/www/html/cron/cron1.php on line 3
  
  PHP Fatal error:  require_once(): Failed opening required '/db/config.php' (include_path='.:/usr/share/pear:/usr/share/php') in /var/www/html/cron/cron1.php on line 3
  
  Fatal error: require_once(): Failed opening required '/db/config.php' (include_path='.:/usr/share/pear:/usr/share/php') in /var/www/html/cron/cron1.php on line 3`
  </code></pre>