Does the older version PHP affects search engine ranking?

Hi,
Folks,
I am having concern with my website: https://www.swatirecipe.com/
That has a great amount of traffic till the last month but I can see a drastic change in search engine traffic and ranking and I am really pissed off, you see.

My website is runningon PHP 5 version, however I heard currently there is PHP 7.0+ is running. Does use of old PHP version hitting my website traffic and am i able to update it from user's end.
Please help!!!

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