PHP · Theory

$ and $$

Theory

11/352

$ and $$

$ and $$ is a PHP topic. In plain words you use it for $marks = 72 in a result script. Don’t start with a slogan — start with that picture.

Smallest example: $name = 'Asha';. Type it, run it, and say what you see. If you can do that from memory, you know $ and $$.

From the example next to this theory — $ and $$: scores array, print avg, then high marks.

Trap — using marks without $. Fix that before you talk about advanced PHP.

Viva — what is $ and $$? Then show $name = 'Asha';. Then name the trap.

Exam tip

What is $ and $$? Show this: $name = 'Asha';. Trap: using marks without $.

Example

<?php
// $ and $$
$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";
}

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

Short notes

Def$ and $$ — $marks = 72 in a result script.
Rule$name = 'Asha';
Trapusing marks without $
Usea result script

PHP · Theory

$ and $$

← All stacks

Theory

11/352

$ and $$

$ and $$ is a PHP topic. In plain words you use it for $marks = 72 in a result script. Don’t start with a slogan — start with that picture.

Smallest example: $name = 'Asha';. Type it, run it, and say what you see. If you can do that from memory, you know $ and $$.

From the example next to this theory — $ and $$: scores array, print avg, then high marks.

Trap — using marks without $. Fix that before you talk about advanced PHP.

Viva — what is $ and $$? Then show $name = 'Asha';. Then name the trap.

Exam tip

What is $ and $$? Show this: $name = 'Asha';. Trap: using marks without $.

Example

<?php
// $ and $$
$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";
}

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

Short notes

Def$ and $$ — $marks = 72 in a result script.
Rule$name = 'Asha';
Trapusing marks without $
Usea result script

$ and $$

Example

Short notes

Questions

$ and $$

Example

Short notes

Questions