PHP - Conditional Statements
You want to print "Adult" if age is 18 or more, "Minor" if less than 18, and "Invalid" if age is negative. Which code correctly uses if-else to do this?
You want to print "Adult" if age is 18 or more, "Minor" if less than 18, and "Invalid" if age is negative. Which code correctly uses if-else to do this?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Check order of conditions for correct logic
Invalid age (negative) must be checked first to avoid wrong classification.Step 2: Verify each option's condition order and output
if ($age < 0) { echo "Invalid"; } elseif ($age >= 18) { echo "Adult"; } else { echo "Minor"; } checks negative first, then adult, else minor. Others check adult first or mix order causing wrong output.Final Answer:
if ($age < 0) { echo "Invalid"; } elseif ($age >= 18) { echo "Adult"; } else { echo "Minor"; } -> Option DQuick Check:
Check invalid first, then adult, else minor [OK]
Quick Trick: Check invalid conditions before others in if-else chains [OK]
Common Mistakes:
- Checking adult before invalid causes wrong output
- Using else if instead of elseif (minor difference but valid)
- Nesting if unnecessarily
Master "Conditional Statements" in PHP
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