standard output function [计] 标准输出函数
This function will dump the object's information to the standard output stream.
该函数将对象的信息转储到标准输出流。
Actually, you can still redirect or pipe stderr, but not stdout, since there will not be any standard output — it's being internally piped to the lp process using the popen function.
实际上，您仍然可以对标准错误使用重定向或管道命令，但不能对标准输出使用，因为没有任何标准输出—正在内部使用popen函数由管道将它输送至lp进程。
WriteContents is called to write the contents of the file to standard output, which it does by calling the fpassthru function in PHP.
调用writeContents以将文件内容写到标准输出，在php中通过调用fpassthru函数实现该功能。
应用推荐