PHP · Theory

Switch

Theory

18/352

Switch

Switch is a PHP topic. In plain words you use it for pass if marks >= 40 in result.php. Don’t start with a slogan — start with that picture.

Smallest example: if / foreach ($arr as $row). Type it, run it, and say what you see. If you can do that from memory, you know Switch.

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

Trap — foreach by reference then reuse the variable. Fix that before you talk about advanced PHP.

Viva — what is Switch? Then show if / foreach ($arr as $row). Then name the trap.

Exam tip

What is Switch? Show this: if / foreach ($arr as $row). Trap: foreach by reference then reuse the variable.

Example

<?php
// Switch
$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";
}

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

Short notes

DefSwitch — pass if marks >= 40 in result.php.
Ruleif / foreach ($arr as $row)
Trapforeach by reference then reuse the variable
Useresult.php

PHP · Theory

Switch

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Theory

18/352

Switch

Switch is a PHP topic. In plain words you use it for pass if marks >= 40 in result.php. Don’t start with a slogan — start with that picture.

Smallest example: if / foreach ($arr as $row). Type it, run it, and say what you see. If you can do that from memory, you know Switch.

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

Trap — foreach by reference then reuse the variable. Fix that before you talk about advanced PHP.

Viva — what is Switch? Then show if / foreach ($arr as $row). Then name the trap.

Exam tip

What is Switch? Show this: if / foreach ($arr as $row). Trap: foreach by reference then reuse the variable.

Example

<?php
// Switch
$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";
}

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

Short notes

DefSwitch — pass if marks >= 40 in result.php.
Ruleif / foreach ($arr as $row)
Trapforeach by reference then reuse the variable
Useresult.php

Switch

Example

Short notes

Questions

Switch

Example

Short notes

Questions