How to use proxies in PHP

Here is an example of a PHP code would be used for a proxy.
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Sample Code (PHP CURL)
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, $header);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_PROXY, $proxy);
curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, 1);
curl_setopt($ch, CURLOPT_USERAGENT, $agent);
$result[‘EXE’] = curl_exec($ch);
$result[‘INF’] = curl_getinfo($ch);
$result[‘ERR’] = curl_error($ch);
curl_close($ch);