PHP · Theory

addcslashes()

Theory

180/352

addcslashes()

If you can teach addcslashes() using Sara walking through addcslashes, you know it. If you only know the heading, you don’t.

For addcslashes(), the PHP runtime is in play. Don’t blame it until you have traced Sara walking through addcslashes.

addcslashes() exists so Sara can keep Sara walking through addcslashes correct in a campus project.

Sara ships addcslashes() in a campus project. That is the use case worth saying.

addcslashes() trap — skipping the failure case for addcslashes. Sara loses marks for that every viva.

After addcslashes(), Sara should still remember skipping the failure case for addcslashes.

Close addcslashes() with: “If I skip it, Sara walking through addcslashes goes wrong like this: skipping the failure case for addcslashes.”

Exam tip

For addcslashes(): definition + a campus project + one failure.

Example

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

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

Short notes

Defaddcslashes() — Sara uses it for Sara walking through addcslashes in a campus project.
Ruleaddcslashes() → one addcslashes step Sara can write from memory.
Rememberaddcslashes() + the PHP runtime (a campus project).
Useaddcslashes() in a campus project (Sara walking through addcslashes).
Trapaddcslashes() — skipping the failure case for addcslashes.
Exaddcslashes() → Sara walking through addcslashes.

PHP · Theory

addcslashes()

← All stacks

Theory

180/352

addcslashes()

If you can teach addcslashes() using Sara walking through addcslashes, you know it. If you only know the heading, you don’t.

For addcslashes(), the PHP runtime is in play. Don’t blame it until you have traced Sara walking through addcslashes.

addcslashes() exists so Sara can keep Sara walking through addcslashes correct in a campus project.

Sara ships addcslashes() in a campus project. That is the use case worth saying.

addcslashes() trap — skipping the failure case for addcslashes. Sara loses marks for that every viva.

After addcslashes(), Sara should still remember skipping the failure case for addcslashes.

Close addcslashes() with: “If I skip it, Sara walking through addcslashes goes wrong like this: skipping the failure case for addcslashes.”

Exam tip

For addcslashes(): definition + a campus project + one failure.

Example

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

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

Short notes

Defaddcslashes() — Sara uses it for Sara walking through addcslashes in a campus project.
Ruleaddcslashes() → one addcslashes step Sara can write from memory.
Rememberaddcslashes() + the PHP runtime (a campus project).
Useaddcslashes() in a campus project (Sara walking through addcslashes).
Trapaddcslashes() — skipping the failure case for addcslashes.
Exaddcslashes() → Sara walking through addcslashes.

addcslashes()

Example

Short notes

Questions

addcslashes()

Example

Short notes

Questions