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php验证请求页面来源

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Release: 2016-05-25 16:46:20
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php验证请求页面来源:

if( $_server['http_x_requested_with'] == 'xmlhttprequest' ) { 
    echo 'ajax'; 
} else { 
    echo 'normal'; 
}
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jquery内部实现ajax的时候,已经加入了标识,jquery源码中是这样的:

xhr.setrequestheader("x-requested-with", "xmlhttprequest");
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所以,在php中可以通过http_x_requested_with来判断,不需要另外实现,下面看原理:在发送ajax请求的时候,我们可以通过xmlhttprequest这个对象,创建自定义的header头信息,如果您使用的是原生的ajax方法,也就是未使用jquery或者其他js框架包装的ajax方法,那么代码如下:

xmlhttprequest.setrequestheader("request_type","ajax");

通过jquery的$.ajax()方法,可以轻松地在发送ajax请求之前,创建我们自定义的header头信息.

$.ajax({ 
    type: "get", 
    url: base_url + 
'php_check_ajax_request/get_user_list.html', 
    beforesend: function (xmlhttprequest) { 
        xmlhttprequest.setrequestheader("request_type","ajax"); 
    }, 
    success: function(data){ 
        $("#user_list").html(data); 
        $tip.hide(); 
        $button.attr('disabled',true); 
    } 
});
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在php获取时:

if (isset($_server['http_request_type']) && $_server['http_request_type'] 
== "ajax"){//ajax提交 
}else{//非ajax提交 
}
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