php函数获取在线ip与客户端ip

<?php
/**
* 获取客户端ip
* @return [string] [description]
*/
function getclientip() {
$ip = null;
if (isset($_server['http_x_forwarded_for'])) {
$arr = explode(',', $_server['http_x_forwarded_for']);
$pos = array_search('unknown',$arr);
if(false !== $pos) unset($arr[$pos]);
$ip = trim($arr[0]);
}elseif (isset($_server['http_client_ip'])) {
$ip = $_server['http_client_ip'];
}elseif (isset($_server['remote_addr'])) {
$ip = $_server['remote_addr'];
}
// ip地址合法验证
$ip = (false !== ip2long($ip)) ? $ip : '0.0.0.0';
return $ip;
}

/**
* 获取在线ip
* @return string
*/
function getonlineip($format=0) {
global $s_global;
if(empty($s_global['onlineip'])) {
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'];
}
preg_match("/[\d\.]{7,15}/", $onlineip, $onlineipmatches);
$s_global['onlineip'] = $onlineipmatches[0] ? $onlineipmatches[0] : 'unknown';
}

if($format) {
$ips = explode('.', $s_global['onlineip']);
for($i=0;$i<3;$i++) {
$ips[$i] = intval($ips[$i]);
}
return sprintf('%03d%03d%03d', $ips[0], $ips[1], $ips[2]);
} else {
return $s_global['onlineip'];
}
}