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<?php
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://defg.abc.fg");
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$ret = curl_exec($ch);
var_dump($ret);
var_dump(curl_error($ch));
curl_close($ch);
bool(false)
string(35) "Couldn't resolve host 'defg.abc.fg'"