PHP File uploading?

that is my script, but when I goto upload a file over 15MB, it never lets me


There is a limit (used to be 7Mb, but might now be 10Mb) to the size of a file that can be uploaded with PHP. You can increase this limit by modifying your PHP.ini file or installing your own version of PHP. The same limit exists when using the web FTP client to upload files (because it uses PHP).

Simon Jessey | Keystone Websites
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Does your application have a specific reason for requiring a web interface for uploading? There are no similar size limitations when using ftp.

Plus you can set it up so that files can either be uploaded to web accessible directories, or write php files that then move them on the servers via ftp and get triggered through a web interface.