fix(phpstan): address phpstan identified type errors and refactor code

Refactor several PHP files to fix type-related errors and potential crash scenarios. These include:

• Checking if a method exists before attempting to call it
• Providing alternatives for default values where a procedure may not exist
• Ensuring variables are initialized properly regardless of whether procedures execute successfully or not
• Casting return types to match the return type in function comments
• Other significant changes to improve overall code stability and predictability.

Related: #149 (closed)