PHP · Theory

array_walk()

Theory

179/352

array_walk()

If you can teach array_walk() (function) using array_walk function on Zara's board, you know it. If you only know the heading, you don’t.

Do array_walk() (function) once by hand. one array_walk function step Zara can write from memory. Change one input. Say the new result out loud.

Without array_walk() (function), a campus project gets messy and array_walk function on Zara's board is hard to trust.

Zara ships array_walk() (function) in a campus project. That is the use case worth saying.

If array_walk function on Zara's board breaks under array_walk() (function), check skipping the failure case for array_walk function first.

After array_walk() (function), Zara should still remember skipping the failure case for array_walk function.

Viva for array_walk() (function): what it is → one array_walk function step Zara can write from memory → the mistake (skipping the failure case for array_walk function).

Exam tip

Say array_walk() (function) in one breath, then one array_walk function step Zara can write from memory, then skipping the failure case for array_walk function.

Example

<?php
// array_walk()
$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";
}

array_walk(): scores array, print avg, then high marks. Say the output.

Short notes

Defarray_walk() (function) — Zara uses it for array_walk function on Zara's board in a campus project.
Rulearray_walk() (function) → one array_walk function step Zara can write from memory.
Rememberarray_walk() (function) + Apache/Nginx (a campus project).
Usearray_walk() (function) in a campus project (array_walk function on Zara's board).
Traparray_walk() (function) — skipping the failure case for array_walk function.
Exarray_walk() (function) → array_walk function on Zara's board.

PHP · Theory

array_walk()

← All stacks

Theory

179/352

array_walk()

If you can teach array_walk() (function) using array_walk function on Zara's board, you know it. If you only know the heading, you don’t.

Do array_walk() (function) once by hand. one array_walk function step Zara can write from memory. Change one input. Say the new result out loud.

Without array_walk() (function), a campus project gets messy and array_walk function on Zara's board is hard to trust.

Zara ships array_walk() (function) in a campus project. That is the use case worth saying.

If array_walk function on Zara's board breaks under array_walk() (function), check skipping the failure case for array_walk function first.

After array_walk() (function), Zara should still remember skipping the failure case for array_walk function.

Viva for array_walk() (function): what it is → one array_walk function step Zara can write from memory → the mistake (skipping the failure case for array_walk function).

Exam tip

Say array_walk() (function) in one breath, then one array_walk function step Zara can write from memory, then skipping the failure case for array_walk function.

Example

<?php
// array_walk()
$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";
}

array_walk(): scores array, print avg, then high marks. Say the output.

Short notes

Defarray_walk() (function) — Zara uses it for array_walk function on Zara's board in a campus project.
Rulearray_walk() (function) → one array_walk function step Zara can write from memory.
Rememberarray_walk() (function) + Apache/Nginx (a campus project).
Usearray_walk() (function) in a campus project (array_walk function on Zara's board).
Traparray_walk() (function) — skipping the failure case for array_walk function.
Exarray_walk() (function) → array_walk function on Zara's board.

array_walk()

Example

Short notes

Questions

array_walk()

Example

Short notes

Questions