Description:
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From manual page: http://www.php.net/function.curl-setopt
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When CURLOPT_SSL_VERIFYPEER is set to false, CURLOPT_SSL_VERIFYHOST must be set explicity (true or false) in order to receive a result. Otherwise, the curl function will fail silently and return no result. 

Test script:
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$ch = curl_init("https://test.com/api/test");
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false); // required to be set to true or false in order to receive a result with CURLOPT_SSL_VERIFYPEER=false
$result = curl_exec($ch);
curl_close($ch);