PHP · Theory

array_sum()

← All stacks

Theory

166/352

array_sum()

Zara only reaches for array_sum() (function) when a array_sum function dry-run has to stay correct in a first job task.

Keep array_sum() (function) small. Zara should finish a array_sum function dry-run in a few lines, not a 40-line dump.

Without array_sum() (function), a first job task gets messy and a array_sum function dry-run is hard to trust.

Use array_sum() (function) when a array_sum function dry-run must stay clear. If a simpler PHP step works, use that instead.

array_sum() (function) miss: skipping the failure case for array_sum function. Fix it before you talk about advanced PHP.

Place array_sum() (function) next to nearby PHP work — one array_sum function step Zara can write from memory is the link.

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

Exam tip

Board: a array_sum function dry-run. Dry-run array_sum() (function). Name the trap: skipping the failure case for array_sum function.

Example

<?php
// array_sum()
$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_sum(): scores array, print avg, then high marks. Say the output.

Short notes

Defarray_sum() (function) — Zara uses it for a array_sum function dry-run in a first job task.
Rulearray_sum() (function) → one array_sum function step Zara can write from memory.
Rememberarray_sum() (function) + the PHP runtime (a first job task).
Usearray_sum() (function) in a first job task (a array_sum function dry-run).
Traparray_sum() (function) — skipping the failure case for array_sum function.
Exarray_sum() (function) → a array_sum function dry-run.

PHP · Theory

array_sum()

← All stacks

Theory

166/352

array_sum()

Zara only reaches for array_sum() (function) when a array_sum function dry-run has to stay correct in a first job task.

Keep array_sum() (function) small. Zara should finish a array_sum function dry-run in a few lines, not a 40-line dump.

Without array_sum() (function), a first job task gets messy and a array_sum function dry-run is hard to trust.

Use array_sum() (function) when a array_sum function dry-run must stay clear. If a simpler PHP step works, use that instead.

array_sum() (function) miss: skipping the failure case for array_sum function. Fix it before you talk about advanced PHP.

Place array_sum() (function) next to nearby PHP work — one array_sum function step Zara can write from memory is the link.

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

Exam tip

Board: a array_sum function dry-run. Dry-run array_sum() (function). Name the trap: skipping the failure case for array_sum function.

Example

<?php
// array_sum()
$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_sum(): scores array, print avg, then high marks. Say the output.

Short notes

Defarray_sum() (function) — Zara uses it for a array_sum function dry-run in a first job task.
Rulearray_sum() (function) → one array_sum function step Zara can write from memory.
Rememberarray_sum() (function) + the PHP runtime (a first job task).
Usearray_sum() (function) in a first job task (a array_sum function dry-run).
Traparray_sum() (function) — skipping the failure case for array_sum function.
Exarray_sum() (function) → a array_sum function dry-run.

array_sum()

Example

Short notes

Questions

array_sum()

Example

Short notes

Questions