import引入文件,为什么要用反斜杠new \文件名

Question

import('Common.Vendor.PHPExcel.PHPExcel',APP_PATH,'.php');
import('Common.Vendor.PHPExcel.PHPExcel.Style',APP_PATH,'.php');
import('Common.Vendor.PHPExcel.PHPExcel.IOFactory',APP_PATH,'.php');
$ExportPath = RUNTIME_PATH."Temp/exportKnowledStandardExcel";

//赋予权限、创建导出临时文件夹
$this->createFolder($ExportPath, 0755);
$lstrFolderPathTemp = iconv("utf-8", "gbk", $ExportPath);

$objPHPExcel = new \PHPExcel();

不用\ 的话，$objPHPExcel = new \PHPExcel();就不能用了，

Answer 1

\表示引用根目录下面的PHPEXcel;不用\的话是引用当前目录下面的 PHPExcel