PHP · Theory

array_diff()

Theory

114/352

array_diff()

Sara only reaches for array_diff() (function) when array_diff function on Sara's board has to stay correct in a first job task.

array_diff() (function) order: meaning → one array_diff function step Sara can write from memory → one limit. Dumping ten features helps nobody.

array_diff() (function) exists so Sara can keep array_diff function on Sara's board correct in a first job task.

Use array_diff() (function) when array_diff function on Sara's board must stay clear. If a simpler PHP step works, use that instead.

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

After array_diff() (function), Sara should still remember skipping the failure case for array_diff function.

Close array_diff() (function) with: “If I skip it, array_diff function on Sara's board goes wrong like this: skipping the failure case for array_diff function.”

Exam tip

For array_diff() (function): definition + a first job task + one failure.

Example

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

Short notes

Defarray_diff() (function) — Sara uses it for array_diff function on Sara's board in a first job task.
Rulearray_diff() (function) → one array_diff function step Sara can write from memory.
Rememberarray_diff() (function) + a .php page (a first job task).
Usearray_diff() (function) in a first job task (array_diff function on Sara's board).
Traparray_diff() (function) — skipping the failure case for array_diff function.
Exarray_diff() (function) → array_diff function on Sara's board.

PHP · Theory

array_diff()

← All stacks

Theory

114/352

array_diff()

Sara only reaches for array_diff() (function) when array_diff function on Sara's board has to stay correct in a first job task.

array_diff() (function) order: meaning → one array_diff function step Sara can write from memory → one limit. Dumping ten features helps nobody.

array_diff() (function) exists so Sara can keep array_diff function on Sara's board correct in a first job task.

Use array_diff() (function) when array_diff function on Sara's board must stay clear. If a simpler PHP step works, use that instead.

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

After array_diff() (function), Sara should still remember skipping the failure case for array_diff function.

Close array_diff() (function) with: “If I skip it, array_diff function on Sara's board goes wrong like this: skipping the failure case for array_diff function.”

Exam tip

For array_diff() (function): definition + a first job task + one failure.

Example

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

Short notes

Defarray_diff() (function) — Sara uses it for array_diff function on Sara's board in a first job task.
Rulearray_diff() (function) → one array_diff function step Sara can write from memory.
Rememberarray_diff() (function) + a .php page (a first job task).
Usearray_diff() (function) in a first job task (array_diff function on Sara's board).
Traparray_diff() (function) — skipping the failure case for array_diff function.
Exarray_diff() (function) → array_diff function on Sara's board.

array_diff()

Example

Short notes

Questions

array_diff()

Example

Short notes

Questions