PHP stream_filter_append() function (with example)

Hey everyone,

I stumbled upon this thread and thought I could share my experience with `stream_filter_append()` in PHP. It's a valuable function that offers great flexibility when dealing with data streams.

One scenario where I applied `stream_filter_append()` was when I needed to parse XML data from a stream, but the data contained invalid characters that caused parsing errors. To overcome this, I created a custom filter that sanitized the input by removing any invalid characters before further processing.

Here's a concise example of how `stream_filter_append()` helped me in this situation:

php
<?php

class XMLSanitizerFilter extends php_user_filter {

    public function filter($in, $out, &$consumed, $closing) {

        while ($bucket = stream_bucket_make_writeable($in)) {

            $sanitizedData = $this->sanitizeData($bucket->data);

            $bucket->data = $sanitizedData;

            $consumed += $bucket->datalen;

            stream_bucket_append($out, $bucket);

        }

        return PSFS_PASS_ON;

    }



    private function sanitizeData($data) {

        // Perform your sanitization logic here

        $sanitizedData = ... // Sanitization steps

        return $sanitizedData;

    }

}



stream_filter_register('xml_sanitizer', 'XMLSanitizerFilter');



$stream = fopen('data.xml', 'r');

stream_filter_append($stream, 'xml_sanitizer');

// Now you can parse the sanitized XML data from the stream

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Hey there!

I have some experience with using `stream_filter_append()` in PHP, so I thought I would jump in and help out. This function is really handy when you need to apply filters to data streams before processing them.

To give you a simple example, let's say you have a stream from a file or a network socket, and you want to filter out any data that matches a certain pattern. You can achieve this by creating a custom filter using `stream_filter_register()` and then appending it to the stream using `stream_filter_append()`.

Here's a basic code snippet that demonstrates how to use `stream_filter_append()`:

php
<?php

class MyFilter extends php_user_filter {

    public function filter($in, $out, &$consumed, $closing) {

        while ($bucket = stream_bucket_make_writeable($in)) {

            // Apply your custom filter logic here

            $bucket->data = str_replace('needle', 'replacement', $bucket->data);

            $consumed += $bucket->datalen;

            stream_bucket_append($out, $bucket);

        }

        return PSFS_PASS_ON;

    }

}



stream_filter_register('my_filter', 'MyFilter');



$stream = fopen('data.txt', 'r');

stream_filter_append($stream, 'my_filter');

// Now you can read from the filtered stream

Hey folks!

I thought I'd join the conversation and share my personal experience with `stream_filter_append()` in PHP. I recently worked on a project where I needed to manipulate the data coming from a stream before processing it, and this function came in handy.

One particular challenge I faced was filtering out sensitive information from the stream. In my case, I wanted to redact any credit card numbers present in the incoming data.

To achieve this, I created a custom filter by extending `php_user_filter` and implemented the `filter()` method. Inside that method, I used regex to search for credit card patterns and replaced them with asterisks or a redacted marker.

Here's a quick example that demonstrates how to use `stream_filter_append()` for credit card redaction:

php
<?php

class CreditCardFilter extends php_user_filter {

    public function filter($in, $out, &$consumed, $closing) {

        while ($bucket = stream_bucket_make_writeable($in)) {

            $bucket->data = preg_replace('/\b\d{4}(\s?\d{4}){3}\b/', '**** **** **** ****', $bucket->data);

            $consumed += $bucket->datalen;

            stream_bucket_append($out, $bucket);

        }

        return PSFS_PASS_ON;

    }

}



stream_filter_register('credit_card_filter', 'CreditCardFilter');



$stream = fopen('data.log', 'r');

stream_filter_append($stream, 'credit_card_filter');

// Now you can read from the stream with credit card numbers redacted

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