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The mkdir() function is used to create a directory (make folder) at server and it returns two outputs that's are TRUE and FALSE .TRUE means success and FALSE means failure.
In the above demo is used to mkdir directory function.just type folder name at New Directory Name and then click to create button and see below of new folder.
Following code is use to mkdir function if you need code to copy and use to your website.
In the above $directory_name script is used to assign a new folder name and mkdir() function is used to create a new folder of web server.
If you need to mkdir function demo code and download from following link.