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PHP · Theory

strtolower()

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Theory

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strtolower()

If you can teach strtolower() using strtolower on Meera's board, you know it. If you only know the heading, you don’t.

strtolower() order: meaning → one strtolower step Meera can write from memory → one limit. Dumping ten features helps nobody.

Skip strtolower() and copy-pasting strtolower without a dry-run shows up in lab hour.

Meera ships strtolower() in lab hour. That is the use case worth saying.

strtolower() miss — copy-pasting strtolower without a dry-run. Fix it before you talk about advanced PHP.

strtolower() is not a lonely heading. Meera ties it to strtolower on Meera's board.

One breath for strtolower(), then strtolower on Meera's board, then copy-pasting strtolower without a dry-run. Sit down.

Exam tip

For strtolower(): definition + lab hour + one failure.

Example

<?php
// strtolower()
$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";
}

strtolower(): scores array, print avg, then high marks. Say the output.

Short notes

  • Defstrtolower() — Meera uses it for strtolower on Meera's board in lab hour.
  • Rulestrtolower() → one strtolower step Meera can write from memory.
  • Rememberstrtolower() + a .php page (lab hour).
  • Usestrtolower() in lab hour (strtolower on Meera's board).
  • Trapstrtolower() — copy-pasting strtolower without a dry-run.
  • Exstrtolower() → strtolower on Meera's board.

Questions

1

Meera asks: why does strtolower() exist? Use strtolower on Meera's board.

2

Name one PHP screen/job that needs strtolower().

3

Viva: one wrong answer people give for strtolower().

4

Change one input on strtolower on Meera's board. Predict the new result.

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