PHP设置页面限制ip和来源访问的方法

<?php
 
$client_ip = getip();
$referer = getreferer();
 
$allow_ip = '192.168.0.100';
$allow_referer = 'http://www.xxx.cn';
 
if($client_ip==$allow_ip && strpos($referer, $allow_referer)===0){
  echo 'allow access';
}else{
  echo 'deny access';
} 
 
// 获取访问者ip
function getip(){
  if(!empty($_SERVER['HTTP_CLIENT_IP'])){
    $cip = $_SERVER['HTTP_CLIENT_IP'];
  }elseif(!empty($_SERVER['HTTP_X_FORWARDED_FOR'])){
    $cip = $_SERVER['HTTP_X_FORWARDED_FOR'];
  }elseif(!empty($_SERVER['REMOTE_ADDR'])){
    $cip = $_SERVER['REMOTE_ADDR'];
  }else{
    $cip = '';
  }
  return $cip;
}
 
// 获取访问者来源
function getreferer(){
  if(isset($_SERVER['HTTP_REFERER'])){
    return $_SERVER['HTTP_REFERER'];
  }
  return '';
}
 
?>