PHP · Theory

array_udiff()

Theory

169/352

array_udiff()

array_udiff() (function) is simple if you keep it on paper. Isha uses it for Isha walking through array_udiff function in a first job task.

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

Without array_udiff() (function), a first job task gets messy and Isha walking through array_udiff function is hard to trust.

Isha ships array_udiff() (function) in a first job task. That is the use case worth saying.

If Isha walking through array_udiff function breaks under array_udiff() (function), check skipping the failure case for array_udiff function first.

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

Close array_udiff() (function) with: “If I skip it, Isha walking through array_udiff function goes wrong like this: skipping the failure case for array_udiff function.”

Exam tip

Board: Isha walking through array_udiff function. Dry-run array_udiff() (function). Name the trap: skipping the failure case for array_udiff function.

Example

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

Short notes

Defarray_udiff() (function) — Isha uses it for Isha walking through array_udiff function in a first job task.
Rulearray_udiff() (function) → one array_udiff function step Isha can write from memory.
Rememberarray_udiff() (function) + a .php page (a first job task).
Usearray_udiff() (function) in a first job task (Isha walking through array_udiff function).
Traparray_udiff() (function) — skipping the failure case for array_udiff function.
Exarray_udiff() (function) → Isha walking through array_udiff function.

PHP · Theory

array_udiff()

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Theory

169/352

array_udiff()

array_udiff() (function) is simple if you keep it on paper. Isha uses it for Isha walking through array_udiff function in a first job task.

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

Without array_udiff() (function), a first job task gets messy and Isha walking through array_udiff function is hard to trust.

Isha ships array_udiff() (function) in a first job task. That is the use case worth saying.

If Isha walking through array_udiff function breaks under array_udiff() (function), check skipping the failure case for array_udiff function first.

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

Close array_udiff() (function) with: “If I skip it, Isha walking through array_udiff function goes wrong like this: skipping the failure case for array_udiff function.”

Exam tip

Board: Isha walking through array_udiff function. Dry-run array_udiff() (function). Name the trap: skipping the failure case for array_udiff function.

Example

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

Short notes

Defarray_udiff() (function) — Isha uses it for Isha walking through array_udiff function in a first job task.
Rulearray_udiff() (function) → one array_udiff function step Isha can write from memory.
Rememberarray_udiff() (function) + a .php page (a first job task).
Usearray_udiff() (function) in a first job task (Isha walking through array_udiff function).
Traparray_udiff() (function) — skipping the failure case for array_udiff function.
Exarray_udiff() (function) → Isha walking through array_udiff function.

array_udiff()

Example

Short notes

Questions

array_udiff()

Example

Short notes

Questions