PHP · Theory

substr()

Theory

266/352

substr()

Priya only reaches for substr() when substr on Priya's board has to stay correct in lab hour.

substr() on the board: one substr step Priya can write from memory. Then say what substr on Priya's board looks like after.

Without substr(), lab hour gets messy and substr on Priya's board is hard to trust.

substr() shows up in lab hour. Name substr on Priya's board, not “a real-world scenario”.

If substr on Priya's board breaks under substr(), check copy-pasting substr without a dry-run first.

substr() is not a lonely heading. Priya ties it to substr on Priya's board.

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

Exam tip

Say substr() in one breath, then one substr step Priya can write from memory, then copy-pasting substr without a dry-run.

Example

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

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

Short notes

Defsubstr() — Priya uses it for substr on Priya's board in lab hour.
Rulesubstr() → one substr step Priya can write from memory.
Remembersubstr() + a .php page (lab hour).
Usesubstr() in lab hour (substr on Priya's board).
Trapsubstr() — copy-pasting substr without a dry-run.
Exsubstr() → substr on Priya's board.

PHP · Theory

substr()

← All stacks

Theory

266/352

substr()

Priya only reaches for substr() when substr on Priya's board has to stay correct in lab hour.

substr() on the board: one substr step Priya can write from memory. Then say what substr on Priya's board looks like after.

Without substr(), lab hour gets messy and substr on Priya's board is hard to trust.

substr() shows up in lab hour. Name substr on Priya's board, not “a real-world scenario”.

If substr on Priya's board breaks under substr(), check copy-pasting substr without a dry-run first.

substr() is not a lonely heading. Priya ties it to substr on Priya's board.

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

Exam tip

Say substr() in one breath, then one substr step Priya can write from memory, then copy-pasting substr without a dry-run.

Example

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

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

Short notes

Defsubstr() — Priya uses it for substr on Priya's board in lab hour.
Rulesubstr() → one substr step Priya can write from memory.
Remembersubstr() + a .php page (lab hour).
Usesubstr() in lab hour (substr on Priya's board).
Trapsubstr() — copy-pasting substr without a dry-run.
Exsubstr() → substr on Priya's board.

substr()

Example

Short notes

Questions

substr()

Example

Short notes

Questions