XSS Prevention — PHP Technical Interview Questions & Answers

XSS Prevention

XSS Prevention

  • XSS Prevention is a PHP topic. In plain words you use it for a short XSS Prevention example in a college portal page. Don’t start with a slogan — start with that picture.
  • Smallest example: the smallest XSS Prevention example you can type. Type it, run it, and say what you see. If you can do that from memory, you know XSS Prevention.
  • From the example next to this theory: XSS Prevention: scores array, print avg, then high marks.
  • Trap: only saying “XSS Prevention” with no example. Fix that before you talk about advanced PHP.
  • Viva: what is XSS Prevention? Then show the smallest XSS Prevention example you can type. Then name the trap.

Technical Interview Tip: What is XSS Prevention? Show this: the smallest XSS Prevention example you can type. Trap: only saying “XSS Prevention” with no example.

Code Examples for XSS Prevention

XSS Prevention — working example

<?php
// XSS Prevention
$scores = [80, 90, 70];
$avg = array_sum($scores) / count($scores);
echo "avg=" . number_format($avg, 1) . "\n";
foreach ($scores as $s) {
  if ($s >= 80) echo "high: $s\n";
}

XSS Prevention: scores array, print avg, then high marks. Say the output.

How to Explain XSS Prevention to an Interviewer

What is XSS Prevention?

Used for a short XSS Prevention example a college portal page Not just the heading

Give one small example of XSS Prevention.

the smallest XSS Prevention example you can type XSS Prevention: scores array, print avg, then high marks

What mistake do beginners make with XSS Prevention?

only saying “XSS Prevention” with no example Show the fix

Where do you use XSS Prevention?

a college portal page a short XSS Prevention example