php debug记录程序执行时间和执行情况

/** * debuging('dtrace'); //查看调用栈 * debuging($var); //打印$var(var_dump) * debuging($var, 'php'); //打印$var(var_export) * debuging($var, $echo, 2); //以json格式输出$var * debuging(__LINE__.__CLASS);//常用于大量if语句体定位, 或者寻找程序结束点 */function debuging($var = '', $echo = '', $die = false, $force = false) {  static $clear;  if (0 && $clear === null) {    ob_end_flush ();    $clear = true;  }  static $d;  if (0 && empty ( $d )) {    $d = 1;    debuging ( 'dtrace' );  }    $force && $_GET ['debug'] = 1;  if (isset ( $_GET ['debug'] )) {    if ('dtrace' === $var) {      dTrace ( $die );    } elseif ($die === 2) {      header ( 'Content-type: application/json' );      echo json_encode ( $var );    } else {      echo "<pre class="brush:php;toolbar:false;">\n";      if ($echo) {        echo "$echo:";      }      if ($echo === 'php')        var_export ( $var );      else        var_dump ( $var );      echo "