I have a project with php 5.

but when I upgraded it to PHP 8 I got this error:

Fatal error: Uncaught TypeError: Unsupported operand types: string + int in ****newresidanbar.php:219 Stack trace: #0 {main} thrown in ****newresidanbar.php on line 219

I know I have to change my source code. but my source code is over 1000 files. if I want to change all my source codes it takes me a lot of time.

Is there any solution to solve this error without a lot of changes?