php 目录遍历opendir函数
opendir()函数的作用是：打开目录句柄。
如果该函数成功运行，将返回一组目录流（一组目录字符串），如果失败将返回错误[error]。你可以在函数的最前面加上“@”来隐藏错误。
syntax 语法 opendir(directory,context) parameter
参数 description
描述 directory required. specifies the directory to stream
必要参数。指定目录对象
可选参数。指定需要处理的目录对象的context。这个context包括了一组选项，它可以对文本流的显示方式进行改变
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