PHP · Theory

Headers

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Theory

347/352

Headers

Headers is a PHP idea you prove with a Headers dry-run, not with a slogan.

For Headers, a .php page is in play. Don’t blame it until you have traced a Headers dry-run.

Headers exists so Riya can keep a Headers dry-run correct in a viva board.

Use Headers when a Headers dry-run must stay clear. If a simpler PHP step works, use that instead.

Headers trap — skipping the failure case for Headers. Riya loses marks for that every viva.

Headers is not a lonely heading. Riya ties it to a Headers dry-run.

One breath for Headers, then a Headers dry-run, then skipping the failure case for Headers. Sit down.

Exam tip

For Headers: definition + a viva board + one failure.

Example

<?php
// Headers
$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";
}

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

Short notes

DefHeaders — Riya uses it for a Headers dry-run in a viva board.
RuleHeaders → one Headers step Riya can write from memory.
RememberHeaders + a .php page (a viva board).
UseHeaders in a viva board (a Headers dry-run).
TrapHeaders — skipping the failure case for Headers.
ExHeaders → a Headers dry-run.

PHP · Theory

Headers

← All stacks

Theory

347/352

Headers

Headers is a PHP idea you prove with a Headers dry-run, not with a slogan.

For Headers, a .php page is in play. Don’t blame it until you have traced a Headers dry-run.

Headers exists so Riya can keep a Headers dry-run correct in a viva board.

Use Headers when a Headers dry-run must stay clear. If a simpler PHP step works, use that instead.

Headers trap — skipping the failure case for Headers. Riya loses marks for that every viva.

Headers is not a lonely heading. Riya ties it to a Headers dry-run.

One breath for Headers, then a Headers dry-run, then skipping the failure case for Headers. Sit down.

Exam tip

For Headers: definition + a viva board + one failure.

Example

<?php
// Headers
$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";
}

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

Short notes

DefHeaders — Riya uses it for a Headers dry-run in a viva board.
RuleHeaders → one Headers step Riya can write from memory.
RememberHeaders + a .php page (a viva board).
UseHeaders in a viva board (a Headers dry-run).
TrapHeaders — skipping the failure case for Headers.
ExHeaders → a Headers dry-run.

Headers

Example

Short notes

Questions

Headers

Example

Short notes

Questions