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Q:

PHP stream_filter_append() function (with example)

Hi everyone,

I'm currently working on a PHP project and I came across the `stream_filter_append()` function. I'm having trouble understanding how to use it and I couldn't find a good example online.

To give you some background, I'm working on a system where I need to filter the data coming in from a stream before processing it further. I heard that `stream_filter_append()` can be useful for this.

Could someone please provide me with an example of how to use the `stream_filter_append()` function in PHP? Specifically, I would like to see how it can be used to filter the data from a stream.

Thanks in advance for your help!

All Replies

luciano.keeling

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


In this example, I created a custom filter class called `XMLSanitizerFilter` that extends `php_user_filter`. Inside the `filter` method, I invoked a separate `sanitizeData()` method to perform the necessary sanitization steps on the incoming stream data.

After registering the filter with `stream_filter_register()`, I opened a stream to an XML file named `data.xml` and then appended the custom filter to the stream using `stream_filter_append()`. From that point onward, I was able to safely parse the sanitized XML data from the stream without encountering any errors.

Feel free to adjust this example to suit your specific use case. If you have any more questions, feel free to ask!

Happy coding,
[Your Name]

eloisa.franecki

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


In this example, we define a custom filter class `MyFilter` that extends `php_user_filter`. Inside the `filter` method, you can apply your desired filtering logic to the data.

After registering the filter using `stream_filter_register()`, we open a stream to a file called `data.txt`. Then, we append our custom filter using `stream_filter_append()`. From this point onwards, any data read from the stream will be processed by our filter.

Feel free to adapt this example to suit your specific needs. Let me know if there's anything else I can assist you with!

Best regards,
[Your Name]

pfeest

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


In this example, I created a custom filter class called `CreditCardFilter`. Inside the `filter` method, I used the `preg_replace()` function to match credit card patterns and replace them with asterisks. You can modify the regex pattern to suit your specific needs.

After registering the filter using `stream_filter_register()`, I opened a stream to a log file called `data.log`. Then, I appended the custom filter to the stream using `stream_filter_append()`. From that point on, any data read from the stream will have the credit card numbers redacted.

Feel free to adapt this example to fit your own requirements. If you have any further questions, feel free to ask!

Happy coding!
[Your Name]

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