! [Input picture Description] (https://static.oschina.net/uploads/img/201604/19160021_NkM5.png "Enter picture title here") ' __file__ and $_server[' Script_ FileName '] is the full path (absolute path) and file name of the returned PHP file, except that $_server[' script_filename ' reflects the absolute path and file name of the current executing program; __file__ reflects the absolute path and file name of the original file (the included file) For example, I write two functions under the test/haha.php file, import the haha.php in the test.php file, and the viewer accesses the test.php output as follows:! [Input picture Description] (https://static.oschina.net/uploads/img/201604/19160424_Psfo.png "Enter the title of the picture here")! [Input picture Description] (https://static.oschina.net/uploads/img/201604/19160328_BOVe.png "Enter the title of the picture here")! [Input picture Description] (https://static.oschina.net/uploads/img/201604/19163031_bxIC.png "Enter the title of the picture here")! [Input picture Description] (https://static.oschina.net/uploads/img/201604/19163303_qsk0.png "Enter the title of the picture here")! [Input picture Description] (https://static.oschina.net/uploads/img/201604/19163457_e7ZR.png "Enter the title of the picture here")! [Input picture Description] (https://static.oschina.net/uploads/img/201604/19163850_4qdK.png "Enter picture title here")