php防止站外远程提交表单的方法 php表单重复提交 php怎么提交表单 php中表单提

<span>php     
</span><span>session_start</span><span>();     
     
</span><span>if</span> (<span>$_POST</span>['submit'] == "go"<span>){     
    </span><span>//</span><span>check token     </span><span>if</span> (<span>$_POST</span>['token'] == <span>$_SESSION</span>['token'<span>]){     
        </span><span>//</span><span>strip_tags     </span><span>$name</span> = <span>strip_tags</span>(<span>$_POST</span>['name'<span>]);     
        </span><span>$name</span> = <span>substr</span>(<span>$name</span>,0,40<span>);     
        </span><span>//</span><span>clean out any potential hexadecimal characters     </span><span>$name</span> = cleanHex(<span>$name</span><span>);     
        </span><span>//</span><span>continue processing....     </span>    }<span>else</span><span>{     
        </span><span>//</span><span>stop all processing! remote form posting attempt!     </span><span>    }     
}     
     
</span><span>$token</span> = <span>md5</span>(<span>uniqid</span>(<span>rand</span>(), <span>true</span><span>));     
</span><span>$_SESSION</span>['token']= <span>$token</span><span>;     
     
 </span><span>function</span> cleanHex(<span>$input</span><span>){     
    </span><span>$clean</span> = <span>preg_replace</span>("![\][xX]([A-Fa-f0-9]{1,3})!", "",<span>$input</span><span>);     
    </span><span>return</span><span>$clean</span><span>;     
}     
</span>?>     

<span>if</span>(<span>$_POST</span>['vcode'] !=<span> get_vcode())
{
    </span><span>exit</span>('验证码校验失败，无法入库'<span>);
}</span>