1.mkdir()函数指定的目录权限只能小于等于系统umask设定的默认权限。
2.chmod()函数不受系统umask影响，可以设置比系统默认权限大的权限。
3.系统的mkdir命令可以设置大于默认值的权限。
总结：
php若要创建一个有读写权限的目录，最好使用以下代码，不要直接使用mkdir函数指定权限，以避免系统umask的影响
mkdir('./xw/'); chmod('./xw/',0777); 
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