PHP · Theory

Echo

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Theory

6/352

Echo

Don’t start Echo with jargon. Start with Hello, Asha. That is the whole point.

Echo on the board — echo / print. Then say what Hello, Asha looks like after.

Without Echo, a web page gets messy and Hello, Asha is hard to trust.

Echo shows up in a web page. Name Hello, Asha, not “a real-world scenario”.

If Hello, Asha breaks under Echo, check missing semicolon first.

After Echo, Vikram should still remember missing semicolon.

Viva for Echo — what it is → echo / print → the mistake (missing semicolon).

Exam tip

For Echo: definition + a web page + one failure.

Example

<?php
// Echo
$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";
}

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

Short notes

DefEcho — Vikram uses it for Hello, Asha in a web page.
RuleEcho → echo / print.
RememberEcho + Apache/Nginx (a web page).
UseEcho in a web page (Hello, Asha).
TrapEcho — missing semicolon.
ExEcho → Hello, Asha.

PHP · Theory

Echo

← All stacks

Theory

6/352

Echo

Don’t start Echo with jargon. Start with Hello, Asha. That is the whole point.

Echo on the board — echo / print. Then say what Hello, Asha looks like after.

Without Echo, a web page gets messy and Hello, Asha is hard to trust.

Echo shows up in a web page. Name Hello, Asha, not “a real-world scenario”.

If Hello, Asha breaks under Echo, check missing semicolon first.

After Echo, Vikram should still remember missing semicolon.

Viva for Echo — what it is → echo / print → the mistake (missing semicolon).

Exam tip

For Echo: definition + a web page + one failure.

Example

<?php
// Echo
$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";
}

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

Short notes

DefEcho — Vikram uses it for Hello, Asha in a web page.
RuleEcho → echo / print.
RememberEcho + Apache/Nginx (a web page).
UseEcho in a web page (Hello, Asha).
TrapEcho — missing semicolon.
ExEcho → Hello, Asha.

Echo

Example

Short notes

Questions

Echo

Example

Short notes

Questions