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Q:

PHP stream_get_meta_data() function (with example)

Hey everyone,

I have been working with PHP streams lately and I came across the `stream_get_meta_data()` function. I'm a bit confused about how it works and would appreciate some help.

To provide some context, I am building a web application that involves reading and writing data streams. I understand that `stream_get_meta_data()` is used to retrieve information about an open stream, but I'm not quite sure how to implement it in my code.

I've read the PHP documentation, but I'm still having trouble grasping the concept. Could someone please explain how the `stream_get_meta_data()` function works with a simple example? I think seeing some code would really help me understand it better.

Thank you in advance for your help!

All Replies

federico94

Hey there,

I've used the `stream_get_meta_data()` function before and I'd be happy to share my experience with you!

In a recent project, I had to work with remote files that were being accessed using streams. I needed to retrieve some information about these streams, such as the underlying transport protocol and URL.

I started by opening the stream using `fopen()` and then used `stream_get_meta_data()` to fetch metadata associated with that specific stream. Here's a simple example to give you a better idea:

php
$stream = fopen('http://example.com', 'r');
$metadata = stream_get_meta_data($stream);

var_dump($metadata);


This will output an array containing various information regarding the stream. Some of the key elements you might find useful are:
- `wrapper_type`: The protocol scheme used by the stream (e.g., "http", "ftp", "file").
- `stream_type`: The type of the stream (e.g., "tcp_socket/ssl", "plainfile").
- `mode`: The mode in which the stream was opened ("r", "w", "a", etc.).
- `uri`: The URI or path of the stream.
- `timed_out`: A boolean indicating if the stream timed out.

By accessing these elements in the `$metadata` array, you can retrieve specific information about the stream and utilize it within your application.

I hope this sheds some light on how to use `stream_get_meta_data()` in your projects. Let me know if you have any further questions!

Cheers!

martine.brakus

Hey folks,

I've also had some experience using the `stream_get_meta_data()` function and wanted to chime in with a different perspective.

In a recent project of mine, I was working on a file upload feature that required reading and analyzing various properties of the uploaded files. I found `stream_get_meta_data()` to be extremely useful in this scenario.

One particular challenge I faced was determining the file size of the uploaded streams. By incorporating `stream_get_meta_data()`, I was able to easily retrieve the file size information using the `['unread_bytes']` attribute from the returned metadata array.

Here's a snippet of how I implemented it:

php
if (isset($_FILES['myfile'])) {
$uploadedStream = fopen($_FILES['myfile']['tmp_name'], 'r');
$metadata = stream_get_meta_data($uploadedStream);

$fileSize = filesize($_FILES['myfile']['tmp_name']);

echo "Stream size: " . $metadata['unread_bytes'] . " bytes" . PHP_EOL;
echo "File size: " . $fileSize . " bytes" . PHP_EOL;
}


By comparing the `['unread_bytes']` attribute with the `filesize()` function, I ensured accurate file size calculations. The `['unread_bytes']` attribute represents the remaining bytes in the stream waiting to be read.

I must say that `stream_get_meta_data()` provides a helpful way to retrieve stream information beyond just file sizes. It offers valuable insight into elements like the wrapper type, whether the stream has timed out, and even the context options used during stream creation.

I hope my experience sheds some additional light on the usefulness and versatility of `stream_get_meta_data()`. However, if you have any further questions, feel free to ask!

Happy coding!

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