PHP - Inheritance and Polymorphism
Which of the following is the correct way to declare a function that accepts an object of class Vehicle or its subclasses in PHP?
Which of the following is the correct way to declare a function that accepts an object of class Vehicle or its subclasses in PHP?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Understand PHP function parameter type hinting
PHP requires the class name followed by a space and the parameter name with a $ sign.Step 2: Validate each option
function start(Vehicle $car) {} matches correct syntax. Options A, B, and D use invalid or incorrect syntax for type hinting.Final Answer:
function start(Vehicle $car) {} -> Option CQuick Check:
Correct PHP type hint syntax = ClassName $param [OK]
Quick Trick: Type hint with ClassName $param, no colon or ampersand [OK]
Common Mistakes:
- Using colon instead of space
- Adding ampersand incorrectly
- Misusing nullable syntax
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