Can Magento 1.9.4 run using PHP 7.3.5?
I have seen a number of Stack Exchange posts to the contrary and some supporting it.
I have PHP 7.3.5 installed on the server but how (if possible) do I tell Magento to use the latest version?
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I have checked and found something for you:
You can check the details report about PHP version support by Magento 1 here.
So, As I have reviewed the doc it will support php7.2.
You can check the future information here.