What is the significance of the parameters passed to the CURLOPT_HEADERFUNCTION callback function in PHP?

The parameters passed to the CURLOPT_HEADERFUNCTION callback function in PHP are significant because they allow you to process the headers received from an HTTP response. This can be useful for tasks such as extracting specific header information or manipulating the headers before they are processed by the HTTP client. 

// Create a callback function to process the headers received from an HTTP response
function handleHeaders($ch, $header_line) {
    // Process the header information as needed
    echo "Received header: " . $header_line . "\n";
    
    return strlen($header_line);
}

// Set the CURLOPT_HEADERFUNCTION option to the callback function
curl_setopt($ch, CURLOPT_HEADERFUNCTION, "handleHeaders");

Keywords

PHP CURLOPT_HEADERFUNCTION callback function parameters significance

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