Talk about PHP input and output flow _php technique

Today, someone asked me again Phpchina how to do PHP XML? , and the corresponding solution has been given. By the way, talk about the input and output stream of PHP.

Today summer vacation in the company, just colleagues use flash to create streaming media, need to use PHP to read the Flash pass over the media information (also XML format), at that time I was also familiar with the basic input and output flow of PHP.

The handbook says:


PHP 3.0.13 and above version, from PHP 4.3.0 support Php://output and Php://input, from PHP 5.0.0 Support Php://filter.


Php://stdin

Php://stdout

Php://stderr

Php://output

Php://input

Php://filter

Php://stdin,php://stdout and Php://stderr allow access to the corresponding input or output stream of the PHP process.

Php://output allows you to write data to the output buffering mechanism, and print () is the same way as Echo ().

Php://input allows you to read the original data for the POST. Compared with $HTTP _raw_post_data, it brings less pressure on memory and does not require any special php.ini settings. Php://input cannot be used for enctype= "Multipart/form-data".

Php://stdin and Php://input are read-only, while Php://stdout,php://stderr and Php://output are written only.

Php://filter is a package protocol designed to allow a filter program to become a stream when it is opened. This is useful for individually full-featured file functions such as ReadFile (), file (), and file_get_contents (), otherwise there is no chance of applying the filter to the stream before the content is read.





This means that the original data for the post is stored in a file called Php://input. You can use the simple file operation to read the data inside to control.

$data =file_get_contents (php://input);