Php wrappers.php () function

Write your php code

PHP input/output streams

PHP 3.0.13 and up, php://output and php://input since PHP 4.3.0, php://filter since PHP 5.0.0.

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 to the output buffer mechanism in the same way as print() and echo().

php://input allows you to read raw POST data. It is a less memory intensive alternative to $HTTP_RAW_POST_DATA and does not need any special php.ini directives.

php://stdin and php://input are read-only, whereas php://stdout, php://stderr and php://output are write-only.

php://filter is a kind of meta-wrapper designed to permit the application of filters to a stream at the time of opening. This is useful with all-in-one file functions such as readfile(), file(), and file_get_contents() where there is otherwise no opportunity to apply a filter to the stream prior the contents being read.

The php://filter target takes the following 'parameters' as parts of its 'path'.

/resource=<stream to be filtered> (required) This parameter must be located at the end of your php://filter specification and should point to the stream which you want filtered.
<?php /* This is equivalent to simply: readfile("http://www.example.com"); since no filters are actually specified */ readfile("php://filter/resource=http://www.example.com"); ?>

/read=<filter list to apply to read chain> (optional) This parameter takes one or more filternames separated by the pipe character |.


<?php
/* This will output the contents of 
   www.example.com entirely in uppercase */
readfile("php://filter/read=string.toupper/resource=http://www.example.com");

/* This will do the same as above
   but will also ROT13 encode it */
readfile("php://filter/read=string.toupper|string.rot13/resource=http://www.example.com");
?>

/write=<filter list to apply to write chain> (optional) This parameter takes one or more filternames separated by the pipe character |.


<?php
/* This will filter the string "Hello World"
   through the rot13 filter, then write to
   example.txt in the current directory */
file_put_contents("php://filter/write=string.rot13/resource=example.txt","Hello World");
?>

/<filter list to apply to both chains> (optional) Any filter lists which are not prefixed specifically by read= or write= will be applied to both the read and write chains (as appropriate).

Table L-6. Wrapper Summary (For php://filter, refer to summary of wrapper being filtered.)

Attribute	Supported
Restricted by allow_url_fopen.	No
Allows Reading	`php://stdin` and `php://input` only.
Allows Writing	`php://stdout`, `php://stderr`, and `php://output` only.
Allows Appending	`php://stdout`, `php://stderr`, and `php://output` only. (Equivalent to writing)
Allows Simultaneous Reading and Writing	No. These wrappers are unidirectional.
Supports stat()	No
Supports unlink()	No
Supports rename()	No
Supports mkdir()	No
Supports rmdir()	No

Php wrappers.php Function syntax tag

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Php wrappers.php syntax tutorial

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