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Php wrappers.php () function

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Php Result

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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.

    /* This is equivalent to simply:
       since no filters are actually specified */


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

    /* This will output the contents of entirely in uppercase */

    /* This will do the same as above
       but will also ROT13 encode it */

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

    /* 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.)

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 WritingNo. 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

wrappers.php php code on this is provided for your study purpose, it will guide you to know how create and design a website using php. use it to practice and train your self online

Php wrappers.php syntax tutorial

php tutorial guide and code design are for easy learning and programming. The code practice section provided at the top is for practising of this syntax. Use the code section up to practice your php programming online. Learning php is very easy, all you need is to use the examples on this site and practice them to perfect your skills.

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