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PHP · Theory

Array extract()

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Theory

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Array extract()

Don’t start Array extract() (function) with jargon. Start with Vikram walking through Array extract function. That is the whole point.

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

Array extract() (function) exists so Vikram can keep Vikram walking through Array extract function correct in a viva board.

Vikram ships Array extract() (function) in a viva board. That is the use case worth saying.

Array extract() (function) miss: only reciting the name of Array extract function. Fix it before you talk about advanced PHP.

Array extract() (function) is not a lonely heading. Vikram ties it to Vikram walking through Array extract function.

Viva for Array extract() (function): what it is → one Array extract function step Vikram can write from memory → the mistake (only reciting the name of Array extract function).

Exam tip

Board: Vikram walking through Array extract function. Dry-run Array extract() (function). Name the trap: only reciting the name of Array extract function.

Example

<?php
$langs = ["PHP", "JS", "SQL"];
$langs[] = "Python";
foreach ($langs as $i => $lang) {
  echo "$i: $lang\n";
}

Array extract() — pHP arrays are ordered maps. foreach walks key and value.

Short notes

  • DefArray extract() (function) — Vikram uses it for Vikram walking through Array extract function in a viva board.
  • RuleArray extract() (function) → one Array extract function step Vikram can write from memory.
  • RememberArray extract() (function) + the PHP runtime (a viva board).
  • UseArray extract() (function) in a viva board (Vikram walking through Array extract function).
  • TrapArray extract() (function) — only reciting the name of Array extract function.
  • ExArray extract() (function) → Vikram walking through Array extract function.

Questions

1

In one breath: what does Array extract() (function) do for Vikram?

2

Name one PHP screen/job that needs Array extract() (function).

3

What trap does Vikram hit with Array extract() (function)?

4

Write the smallest Array extract() (function) step on Vikram walking through Array extract function. What happens?

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