目录问题: 如何判断 ./ ../111/ ../../abc/111/是指的同一个目录???

有一个目录:c:/abc/111/index.php

./ ../111/ ../../abc/111/是指的同一个目录

我的问题是:在我的php程序中如何判断 ./ ../111/ ../../abc/111/是指的同一个目录???
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if(realpath("../111/") == realpath("../../abc/111/"))

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