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php操作mysql这句错在那里了呢？解决思路

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Release： 2016-06-13 11:05:51
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php操作mysql这句错在那里了呢？

    $cmd = 'UPDATE appdata SET sData ="'.$_post["u_content"].'"'.'WHERE User ="'.$_post["u_email"].'"';<br />    $data = mysql_query($cmd) or die("失败了！");
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不用post是正确的可以修改，但是用post就出错了，该怎么改呢？谢谢～
------解决方案--------------------
$_POST 要大写

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appdata cmd mysql nbsp post
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