PHP · Theory

Parameterized

Theory

27/352

Parameterized

Parameterized (function) is a PHP topic. In plain words you use it for function add($a, $b) in a marks helper. Don’t start with a slogan — start with that picture.

Smallest example: function name($x) { return $x; }. Type it, run it, and say what you see. If you can do that from memory, you know Parameterized (function).

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

Trap — no return so the caller gets null. Fix that before you talk about advanced PHP.

Viva — what is Parameterized (function)? Then show function name($x) { return $x; }. Then name the trap.

Exam tip

What is Parameterized (function)? Show this: function name($x) { return $x; }. Trap: no return so the caller gets null.

Example

<?php
// Parameterized
$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";
}

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

Short notes

DefParameterized (function) — function add($a, $b) in a marks helper.
Rulefunction name($x) { return $x; }
Trapno return so the caller gets null
Usea marks helper

PHP · Theory

Parameterized

← All stacks

Theory

27/352

Parameterized

Parameterized (function) is a PHP topic. In plain words you use it for function add($a, $b) in a marks helper. Don’t start with a slogan — start with that picture.

Smallest example: function name($x) { return $x; }. Type it, run it, and say what you see. If you can do that from memory, you know Parameterized (function).

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

Trap — no return so the caller gets null. Fix that before you talk about advanced PHP.

Viva — what is Parameterized (function)? Then show function name($x) { return $x; }. Then name the trap.

Exam tip

What is Parameterized (function)? Show this: function name($x) { return $x; }. Trap: no return so the caller gets null.

Example

<?php
// Parameterized
$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";
}

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

Short notes

DefParameterized (function) — function add($a, $b) in a marks helper.
Rulefunction name($x) { return $x; }
Trapno return so the caller gets null
Usea marks helper

Parameterized

Example

Short notes

Questions

Parameterized

Example

Short notes

Questions