title: php - don't show notice error
body: <p>i don't get notice when i try to echo a variable that not declare.
  Why ?</p>
  
  <pre><code>    error_reporting  =  E_ALL &amp; ~E_NOTICE
      display_errors = On
      error_log = "F:\phperror.log"
  
      zend_extension_ts="F:\work\xampp168w7\php\ext\php_xdebug.dll"
      xdebug.remote_enable=true
      xdebug.remote_host=127.0.0.1
      xdebug.remote_port=9000
      xdebug.remote_handler=dbgp
      xdebug.profiler_enable=1
      xdebug.profiler_output_dir="F:\work\xampp168w7\tmp"
  </code></pre>