Hello, Magento Buddies!
While upgrading to Magento 2.4.x, many of us find the error in the function str_contains(). This is caused by PHP 8 and Magento version 2.4.3 and 2.3.7-p1 are compatible with PHP 7.4. Deep dive into PHP Fatal Error “Call to Undefined Function str_contains()” After Upgrading to Magento 2.4.x.
Complete Tutorial at PHP Fatal Error “Call to Undefined Function str_contains()” After Upgrading to Magento 2.4.x
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