PHP website many error

I'm facing a runtime error in my PHP application that's causing the page to stop loading. This issue occurs specifically in the database connection section.

Key Requirements:
- Expertise in PHP and database interactions
- Experience troubleshooting and resolving runtime errors
- Ability to quickly identify and fix issues causing page load failures

Ideal Skills and Experience:
- Strong background in backend development
- Proficient in error debugging and problem-solving
- Familiarity with various database systems (e.g., MySQL, PostgreSQL)

Please provide a brief overview of your approach and estimated time for resolution.