I have a software which has different folders with php files in it.I would like to change these file names in all folders.Examples I have a file name appointment.php now i would like to change it to appoint.php in all related php files and folders.How can i do that.Changing it manually will take lot of time.I have in all 100 files in which i need to change.I need a code or method which changes this in all files and folders.please overlook my English if mistakes done

```
appointment.php to `appoint.php`

```