出处 discuz
if(getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), 'unknown')) {
$onlineip = getenv('HTTP_CLIENT_IP');
} elseif(getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), 'unknown')) {
$onlineip = getenv('HTTP_X_FORWARDED_FOR');
} elseif(getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), 'unknown')) {
$onlineip = getenv('REMOTE_ADDR');
}
elseif(isset($_SERVER['REMOTE_ADDR']) &&
$_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'],
'unknown')) {
$onlineip = $_SERVER['REMOTE_ADDR'];
}
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