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array curl_version ([ int $age = CURLVERSION_NOW ] )

<?php
// Get cURL version array
$version = curl_version();

// Use bitfields to check for certain features in the cURL compiled version
$bitfields = Array(
            'CURL_VERSION_IPV6', 
            'CURL_VERSION_KERBEROS4', 
            'CURL_VERSION_SSL', 
            'CURL_VERSION_LIBZ'
            );

foreach($bitfields as $feature)
{
    echo $feature . ($version['features'] & constant($feature) ? ' matches' : ' does not match');
    echo PHP_EOL;
}
?>