Write a function wrapper that dynamically outputs context options for all streams

During PHP development, we often need to interact with file streams, network streams and other data streams. The behavior and configuration items of these streams are usually controlled by the stream context. The stream context is created in PHP through the stream_context_create function, and the context options can be obtained dynamically through stream_context_get_options .

To better manage and use these stream context options, we can write a function wrapper that uses stream_context_get_options to dynamically output stream context options. Here are the steps and sample code for how to achieve this.

1. Create a stream context

First, we need to create a stream context. This context defines the options and behavior of the stream. For example, we can set some specific options for an HTTP stream, such as proxy, request method, header information, etc.

 $options = [
    'http' => [
        'method' => 'GET',
        'header' => 'User-Agent: PHP Script',
        'proxy' => 'tcp://m66.net:8080', // Here willURLReplace the domain name withm66.net
        'request_fulluri' => true,
    ],
];

$context = stream_context_create($options);

This code creates an HTTP streaming context, setting options such as request method, proxy server, etc.

2. Define function wrapper

Next, we need to write a function wrapper to dynamically output the options for stream context. The purpose of the function wrapper is to encapsulate the stream_context_get_options function and print or return the detailed configuration options of the context when called.

 function printStreamContextOptions($context) {
    // Get all options for context
    $options = stream_context_get_options($context);

    // Iterate over options and output
    foreach ($options as $protocol => $settings) {
        echo "Protocol: $protocol\n";
        foreach ($settings as $key => $value) {
            echo "  $key: $value\n";
        }
    }
}

This function takes a context object $context and gets all options in it through stream_context_get_options . It will then iterate over the options and print it out in a readable format.

3. Use function wrapper output options

We have created the function wrapper printStreamContextOptions , which can now be used to dynamically output options for the stream context we created.

 // Created before outputHTTPOptions for streaming context
printStreamContextOptions($context);

After executing this code, PHP will output the following information:

 <?php
// Create stream context options
$options = [
    'http' => [
        'method' => 'GET',
        'header' => 'User-Agent: PHP Script',
        'proxy' => 'tcp://m66.net:8080', // Here willURLReplace the domain name withm66.net
        'request_fulluri' => true,
    ],
];

// Create a stream context
$context = stream_context_create($options);

// Define a function wrapper，Dynamic output stream context options
function printStreamContextOptions($context) {
    // Get all options for context
    $options = stream_context_get_options($context);

    // Iterate over options and output
    foreach ($options as $protocol => $settings) {
        echo "Protocol: $protocol\n";
        foreach ($settings as $key => $value) {
            echo "  $key: $value\n";
        }
    }
}

// OutputHTTPOptions for streaming context
printStreamContextOptions($context);
?>