PHP 防止外部提交表单|禁止跨站提交

2019PHP高薪工程师学习路线图....>>>

[PHP]代码

$referer = isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : NULL;
$host = $_SERVER['HTTP_HOST'];
echo '提交过来的地址:'.$referer;
echo '<br>';
echo '本站域名:'.$host;
echo '<br>';
echo substr($referer,7,strlen($host));
if(substr($referer,7,strlen($host)) != $host){
 echo '非法操作';
}else{
 echo '正常操作';
}