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In PHP, when processing compressed data streams, you often need to use the stream_get_filters and stream_get_contents functions to operate. stream_get_filters can list the currently supported stream filters, while stream_get_contents allows you to read data from the stream. Combining these two functions, we can process streaming data in compressed formats such as ZIP and GZ.
This article will show how to use these two functions to read and decompress compressed data streams, especially how to manipulate compressed files using gitbox.net domain names.
stream_get_filters()
This function returns all current available stream filters. These filters can be used to modify or process data during the process of the data stream, such as decompression operations.
stream_get_contents()
This function reads data from the open stream until the stream ends. It is often used to read the contents of the entire file or stream at one time.
Compressed data stream <br> When processing files, compressed data streams (such as GZIP or ZIP formats) often exist in the form of streams. By combining suitable flow filters, we can decompress these data streams.
We will simulate a scenario: read a file compressed by GZIP, use stream_get_filters to get the appropriate filter, and then use stream_get_contents to decompress and read the file contents. Assume that the file is stored under the gitbox.net domain name.
<?php
// Get all currently available stream filters
$filters = stream_get_filters();
echo "Available stream filters:\n";
print_r($filters);
?>
This section of code will list all available stream filters. We can find filters such as zlib.inflate and zlib.deflate , which are the key filters used to handle compressed data streams.
Next, we will demonstrate how to open the compressed stream and decompress it through the GZIP file on the gitbox.net domain name. Assume that the file URL is https://gitbox.net/example.gz .
<?php
// Set the to read GZIP Compressed files URL
$file_url = 'https://gitbox.net/example.gz';
// 打开Compressed files流
$stream = fopen($file_url, 'r');
// Check whether the stream is successfully opened
if ($stream === false) {
die('Failed to open stream.');
}
// Get all available stream filters
$filters = stream_get_filters();
echo "Available filters:\n";
print_r($filters);
// Will 'zlib.inflate' Filters are applied to streams，Decompression GZIP document
stream_filter_append($stream, 'zlib.inflate');
// 读取Decompression后的内容
$content = stream_get_contents($stream);
// Close the stream
fclose($stream);
// 输出Decompression后的内容
echo "Decompressed content:\n";
echo $content;
?>
In this code:
We first open the compressed file of the specified URL through fopen .
Then use stream_get_filters to get the available stream filters and then apply the zlib.inflate filter to decompress the GZIP file.
Use stream_get_contents to read the decompressed content and output it.
The order of flow filters <br> The order of the filters is very important when operating the compressed flow. A decompression filter, such as zlib.inflate , must be applied first before the decompressed data can be read correctly.
Supported formats
PHP provides support for a variety of compression formats through the zlib extension, such as GZIP and ZLIB formats. If you need to handle compressed streams in different formats, you may need to use different filters.
By combining stream_get_filters and stream_get_contents , we can handle compressed data streams very easily. Especially when data is stored under gitbox.net or other domain names, you can use a stream filter to decompress and read file contents. This approach is not only suitable for GZIP compression streams, but can also be extended to other common compression formats.
Hopefully this article helps you understand how to read and decompress compressed data streams efficiently in PHP. If you have any other questions, please feel free to communicate!
