[Solved] Which of the following is the correct way to declare an interface named Vehicle in PHP? — Ans: interface Vehicle { public function start(); } | PHP

PHP - Interfaces and Traits

Which of the following is the correct way to declare an interface named Vehicle in PHP?

Aclass Vehicle { public function start(); }

Binterface Vehicle { public function start(); }

Cinterface Vehicle { function start() {} }

Dinterface Vehicle { public function start() {} }

Step-by-Step Solution

Solution:

Step 1: Recall interface method declaration rules
In interfaces, methods are declared without code blocks (no curly braces with code).
Step 2: Check each option
'interface Vehicle { public function start(); }' declares interface and method without code, which is correct. Declarations with method bodies '{}' are wrong. Using 'class' instead of 'interface' is incorrect.
Final Answer:
interface Vehicle { public function start(); } -> Option B
Quick Check:
Interface methods have no body [OK]

Quick Trick: Interface methods end with semicolon, no braces [OK]

Common Mistakes:

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Which of the following is the correct way to declare an interface named Vehicle in PHP?