PHP · Theory

array_keys()

Theory

135/352

array_keys()

array_keys() (function) is simple if you keep it on paper. Sara uses it for array_keys function on Sara's board in a campus project.

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

Skip array_keys() (function) and only reciting the name of array_keys function shows up in a campus project.

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

array_keys() (function) miss — only reciting the name of array_keys function. Fix it before you talk about advanced PHP.

After array_keys() (function), Sara should still remember only reciting the name of array_keys function.

Close array_keys() (function) with: “If I skip it, array_keys function on Sara's board goes wrong like this: only reciting the name of array_keys function.”

Exam tip

Board: array_keys function on Sara's board. Dry-run array_keys() (function). Name the trap: only reciting the name of array_keys function.

Example

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

Short notes

Defarray_keys() (function) — Sara uses it for array_keys function on Sara's board in a campus project.
Rulearray_keys() (function) → one array_keys function step Sara can write from memory.
Rememberarray_keys() (function) + Apache/Nginx (a campus project).
Usearray_keys() (function) in a campus project (array_keys function on Sara's board).
Traparray_keys() (function) — only reciting the name of array_keys function.
Exarray_keys() (function) → array_keys function on Sara's board.

PHP · Theory

array_keys()

← All stacks

Theory

135/352

array_keys()

array_keys() (function) is simple if you keep it on paper. Sara uses it for array_keys function on Sara's board in a campus project.

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

Skip array_keys() (function) and only reciting the name of array_keys function shows up in a campus project.

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

array_keys() (function) miss — only reciting the name of array_keys function. Fix it before you talk about advanced PHP.

After array_keys() (function), Sara should still remember only reciting the name of array_keys function.

Close array_keys() (function) with: “If I skip it, array_keys function on Sara's board goes wrong like this: only reciting the name of array_keys function.”

Exam tip

Board: array_keys function on Sara's board. Dry-run array_keys() (function). Name the trap: only reciting the name of array_keys function.

Example

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

Short notes

Defarray_keys() (function) — Sara uses it for array_keys function on Sara's board in a campus project.
Rulearray_keys() (function) → one array_keys function step Sara can write from memory.
Rememberarray_keys() (function) + Apache/Nginx (a campus project).
Usearray_keys() (function) in a campus project (array_keys function on Sara's board).
Traparray_keys() (function) — only reciting the name of array_keys function.
Exarray_keys() (function) → array_keys function on Sara's board.

array_keys()

Example

Short notes

Questions

array_keys()

Example

Short notes

Questions