PHP - Functions
You want to create a function that calculates the total price with tax. The tax rate should default to 0.2 (20%) if not provided. Which function definition is correct?
You want to create a function that calculates the total price with tax. The tax rate should default to 0.2 (20%) if not provided. Which function definition is correct?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Identify parameter order rules
Parameters with defaults must come after those without defaults.Step 2: Check each function signature
function totalPrice($price, $tax = 0.2) { return $price * (1 + $tax); } has required $price first, then default $tax (correct). function totalPrice($tax = 0.2, $price) { return $price * (1 + $tax); } and D have default before required (invalid). function totalPrice($price, $tax) { return $price * (1 + $tax); } has no default for $tax (not meeting requirement).Final Answer:
function totalPrice($price, $tax = 0.2) { return $price * (1 + $tax); } -> Option CQuick Check:
Correct parameter order with default value [OK]
Quick Trick: Put required parameters first, defaults last [OK]
Common Mistakes:
- Placing default parameters before required ones
- Omitting default value for optional parameters
- Confusing parameter order
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