Deprecated: Using ${var} in strings is deprecated, use {$var} instead in
https://php.watch/versions/8.2/$%7Bvar%7D-string-interpolation-deprecated

Creation of dynamic property is deprecated
PHP 8.2: Dynamic Properties are deprecated
https://php.watch/versions/8.2/dynamic-properties-deprecated

Fatal error: Array and string offset access syntax with curly braces is no longer supported
Array and string offset access syntax with curly braces is deprecated
https://stackoverflow.com/questions/59158548/array-and-string-offset-access-syntax-with-curly-braces-is-deprecated

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SELECT list is not in GROUP BY clause and contains nonaggregated column

https://stackoverflow.com/questions/41887460/select-list-is-not-in-group-by-clause-and-contains-nonaggregated-column-inc

Modern PHP Cheat Sheet
A to-the-point summary of all awesome PHP features
https://front-line-php.com/cheat-sheet

4 new features in PHP 8 that promote bad practices
https://medium.com/efesent-solutions/5-new-features-in-php-8-that-promote-bad-practices-6b74ce40d2f2

https://front-line-php.com/cheat-sheet

Best PDF merger tool of 2020: Free and paid, for Windows, Mac, Android and online: https://www.techradar.com/best/best-pdf-merger

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Jpg to pdf : https://jpg2pdf.com/

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Combine JPG’s into one PDF with PHP:

https://stackoverflow.com/questions/25680490/combine-jpgs-into-one-pdf-with-php

Merge PDF files with PHP – ! suggest PDFMerger

https://stackoverflow.com/questions/4794435/merge-pdf-files-with-php

https://github.com/clegginabox/pdf-merger

Need Imagick: How to install and enable the Imagick extension in XAMPP for Windows

https://ourcodeworld.com/articles/read/349/how-to-install-and-enable-the-imagick-extension-in-xampp-for-windows