PHP 根据日期生成目录，检测目录存在，不存在自动建目录
$path=date("Y-m-d"); //获取当前时间
if(file_exists($path)) rmdir($path); //检测变量中的文件夹是否存在，如果存在，删除
{
mkdir($path,0777); //创建文件夹
}
echo $path;
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