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[Custom Module] Save temporary file


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I am just trying to develop my first simple module to understand Prestashop better.


What I am trying now is to create a QR-Code PNG which should be saved to some temporary folder for download.


My problem now is that my PNG file is created but not saved into any specified folder I tried.

I changed already folder permissions to 777 but that didnt help.

Tried with very basic PHP file manipulation fopen/fwrite/fclose but still no success.


Can someone please explain me the general procedure of dynamically open, change and save files within Prestashop modules?


Any help is truly appreciated!




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