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How to change folder name to ubuntu root directory

I am trying to change folder name on Ubuntu root directory. It is working from terminal, but when I apply the same command in PHP, the name is not changed. 

exec("mv old_name new_name");

I have also tried this: 

exec("mv /old_name /new_name");
Solution

  • Use rename — Renames a file or directory

    <?php
rename("/tmp/tmp_file.txt", "/home/user/login/docs/my_file.txt");
?>

    For more info refer this link: http://php.net/manual/en/function.rename.php