PHP · Theory

htmlspecialchars()

Theory

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htmlspecialchars()

If you can teach htmlspecialchars() using a htmlspecialchars dry-run, you know it. If you only know the heading, you don’t.

For htmlspecialchars(), Apache/Nginx is in play. Don’t blame it until you have traced a htmlspecialchars dry-run.

Skip htmlspecialchars() and copy-pasting htmlspecialchars without a dry-run shows up in lab hour.

htmlspecialchars() shows up in lab hour. Name a htmlspecialchars dry-run, not “a real-world scenario”.

htmlspecialchars() miss — copy-pasting htmlspecialchars without a dry-run. Fix it before you talk about advanced PHP.

htmlspecialchars() is not a lonely heading. Amit ties it to a htmlspecialchars dry-run.

Viva for htmlspecialchars(): what it is → one htmlspecialchars step Amit can write from memory → the mistake (copy-pasting htmlspecialchars without a dry-run).

Exam tip

Board: a htmlspecialchars dry-run. Dry-run htmlspecialchars(). Name the trap: copy-pasting htmlspecialchars without a dry-run.

Example

<?php
// htmlspecialchars()
$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";
}

htmlspecialchars(): scores array, print avg, then high marks. Say the output.

Short notes

Defhtmlspecialchars() — Amit uses it for a htmlspecialchars dry-run in lab hour.
Rulehtmlspecialchars() → one htmlspecialchars step Amit can write from memory.
Rememberhtmlspecialchars() + Apache/Nginx (lab hour).
Usehtmlspecialchars() in lab hour (a htmlspecialchars dry-run).
Traphtmlspecialchars() — copy-pasting htmlspecialchars without a dry-run.
Exhtmlspecialchars() → a htmlspecialchars dry-run.

<?php // htmlspecialchars() $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"; }

htmlspecialchars()

Example

Short notes

Questions

htmlspecialchars()

Example

Short notes

Questions