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void curl_reset ( resource $ch )

<?php
// Create a cURL handle
$ch = curl_init();

// Set the CURLOPT_USERAGENT option
curl_setopt($ch, CURLOPT_USERAGENT, "My test user-agent");

// Reset all previously set options
curl_reset($ch);

// Send an HTTP request
curl_setopt($ch, CURLOPT_URL, 'http://w3cschool.cc/');
curl_exec($ch); // the previously set user-agent will not be sent, it has been reset by curl_reset

// Close the handle
curl_close($ch);
?>