Library for easier work with external filters

Encapsulation of a command along with its options which provides a filter method. Its primary role is to facilitate filtering operations within a pipeline, allowing for easy chaining and execution of executable filters.

use PetrKnap\ExternalFilter\Filter;

# echo "H4sIAAAAAAAAA0tJLEkEAGPz860EAAAA" | base64 --decode | gzip --decompress
echo Filter::new('base64', ['--decode'])
    ->pipe(Filter::new('gzip', ['--decompress']))
    ->filter('H4sIAAAAAAAAA0tJLEkEAGPz860EAAAA');

If you want to process external data, redirect output or get errors, you can use input, output or error streams.

use PetrKnap\ExternalFilter\Filter;

$errorStream = fopen('php://memory', 'w+');

Filter::new('php')->filter(
    '<?php fputs(fopen("php://stderr", "w"), "error");',
    error: $errorStream,
);

rewind($errorStream);
echo stream_get_contents($errorStream);
fclose($errorStream);

If you want to call PHP code in the pipeline, you can via factory.

use PetrKnap\ExternalFilter\Filter;

echo Filter::new(phpSnippet: 'fputs(STDOUT, fgets(STDIN));')
    ->filter(b'data');

Run composer require petrknap/external-filter to install it. You can support this project via donation. The project is licensed under the terms of the LGPL-3.0-or-later.

petrknap/php-external-filter

Library for easier work with external filters