Which php functions are essential for adding content into file or uploading file?

[postcd]

Hello,

please without which php functions would be impossible to add content into file or upload an file from (computer or url) within an php script?

i wish to find which functions are essential for doing that task:

• adding new content to a file on apache, php webhosting
• uploading new file (from computer or url or from whatever)
• creating a file with content from within php script

thank You

[Mittineague]

Looking for these?

Filesystem Functions
Directory Functions

[s_molinari]

Also this.

http://php.net/manual/en/book.fileinfo.php

And this is good info about file uploading: http://php.net/manual/en/features.file-upload.php

Scott