PHP · Theory

XSS Prevention

Theory

340/352

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.

Exam tip

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

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.

Short notes

DefXSS Prevention — a short XSS Prevention example in a college portal page.
Rulethe smallest XSS Prevention example you can type
Traponly saying “XSS Prevention” with no example
Usea college portal page

PHP · Theory

XSS Prevention

← All stacks

Theory

340/352

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.

Exam tip

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

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.

Short notes

DefXSS Prevention — a short XSS Prevention example in a college portal page.
Rulethe smallest XSS Prevention example you can type
Traponly saying “XSS Prevention” with no example
Usea college portal page

XSS Prevention

Example

Short notes

Questions

XSS Prevention

Example

Short notes

Questions