语法：bool切换目录（字符串目录）dirDirectory改变to.Changes当前工作目录。

在成功返回真。如果发生错误，则返回FALSE。

范例

<?php

if (chdir("upload")) {
   print "Changed current directory successfully";
}

?>
Output:
Changed current directory successfully
Explanation:
This code changes the working directory to the upload directory in the previous working directory.

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