php - Want to save content from a textarea server sided (in a file on the server permanent) -

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how's going?
i'm relatively new php scene don't know everything. latest project file-/imageviewer. i've got basic script give out files, images , can open them also. yesterday programmed area editing textfiles (such .md, .txt, .pdf,..). haven't seen solution save content on files permanent (server sided). file_put_contents() , fputs() content gets saved client sided every time refresh page "new" content away. has idea fix or thinks knows how different way? important thing is, can edit .pdf files, other files supposed feature. here's site i'm working on (i'm german, don't wonder ...^^):

http://florian.thomasgoetzrath.de/pdfviewer/viewer.php

thanks fast , constructive helpers :^),
f9lke


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