'while'语句显示php中的奇怪行为

Question

在下面的代码中，如果我取消注释print语句，代码工作正常..打印'11'但在注释后显示内存转储错误。  怎么可能...... php版本5.5.9

public static function checkFinalLayerConditions($profileObj,$layerToShow,$interestsPending,$getTotalLayers) {
    $profileid = $profileObj->getPROFILEID();
    $picObj= new PictureService($profileObj);
    $havePhoto= $picObj->isProfilePhotoPresent();print($layerToShow);
    while (1) { //print($layerToshow);
      if ($layerToShow) {
        $show = 0;print($layerToShow); die();
        switch ($layerToShow) {
          case '1': if ($havePhoto == null)
                      $show=1;
                    break;
          case '2': if ($profileObj->getDetail("","","FAMILYINFO")[FAMILYINFO]=='')
                      $show=1;
                    break;          
          case '3': if ($interestsPending > 0)
                      $show=1;
                    break;            
          default : break;
        }