How to Configure Custom HTTP Headers with PHP's file_get_contents()?

HTTP Header Configuration with file_get_contents() in PHP

While file_get_contents() enables the retrieval of remote file content, you may encounter the need to set custom HTTP headers during the request. Traditionally, the User-Agent header can be configured via the php.ini file. However, this limitation does not preclude the possibility of specifying additional HTTP headers, such as Accept, Accept-Language, and Connection.

To achieve this, you can utilize the stream_context_create() function in conjunction with file_get_contents(). The context resource instantiated by stream_context_create() allows for the specification of various options related to the request, including custom HTTP headers. Here's an example:

// Define the HTTP headers
$headers = [
    'Accept' => 'application/json',
    'Accept-Language' => 'en-US,en;q=0.8',
    'Connection' => 'Keep-Alive'
];

// Create a stream context with the specified headers
$context = stream_context_create([
    'http' => [
        'header' => implode("\r\n", $headers)
    ]
]);

// Retrieve the remote file content with the custom HTTP headers
$fileContent = file_get_contents('http://example.com', false, $context);

By leveraging this technique, you can effectively set custom HTTP headers when making requests using file_get_contents(), enabling you to fully control the request parameters as per your requirements.

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