PHP Three types of CLI constants: Stdin,stdout,stderr

PHP CLI (Command line interface), there are three system constants, respectively, stdin, STDOUT, STDERR, representing the file handle.

Application One:

<?phpwhile ($line = fopen (' Php://stdin ', ' r ')) {    echo fgets ($line);}? >

Application Two:

<?php    echo STDIN;? >

Returns the stdin file pointer (file handle) directly under the DOS command line.

Application Three:

<?php    Echo fgets (STDIN);? >

StdIn can get a DOS input, fgets read the stdin file handle, you can print out what you just entered.

PHP Three types of CLI constants: Stdin,stdout,stderr