php中mkdir中异常，浪费时间甚多
php中mkdir中错误，浪费时间甚多
mkdir若上级目录不存在，刚无法创建。此点请注意。我在做王容说的图片上传时浪费时间很多。
第二个知识点：返回文档实际的路径函数：
function fileDir(){
$arr=explode('/',$_SERVER[SCRIPT_FILENAME]);
for($k=0;$k<count return implode><br>
<br>
<div class="clear">
</div></count>
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