PHP · Theory

str_pad()

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Theory

232/352

str_pad()

If you can teach str_pad() using a str_pad dry-run, you know it. If you only know the heading, you don’t.

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

Without str_pad(), lab hour gets messy and a str_pad dry-run is hard to trust.

Amit ships str_pad() in lab hour. That is the use case worth saying.

If a str_pad dry-run breaks under str_pad(), check copy-pasting str_pad without a dry-run first.

Place str_pad() next to nearby PHP work — one str_pad step Amit can write from memory is the link.

Viva for str_pad(): what it is → one str_pad step Amit can write from memory → the mistake (copy-pasting str_pad without a dry-run).

Exam tip

Board: a str_pad dry-run. Dry-run str_pad(). Name the trap: copy-pasting str_pad without a dry-run.

Example

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

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

Short notes

Defstr_pad() — Amit uses it for a str_pad dry-run in lab hour.
Rulestr_pad() → one str_pad step Amit can write from memory.
Rememberstr_pad() + a .php page (lab hour).
Usestr_pad() in lab hour (a str_pad dry-run).
Trapstr_pad() — copy-pasting str_pad without a dry-run.
Exstr_pad() → a str_pad dry-run.

PHP · Theory

str_pad()

← All stacks

Theory

232/352

str_pad()

If you can teach str_pad() using a str_pad dry-run, you know it. If you only know the heading, you don’t.

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

Without str_pad(), lab hour gets messy and a str_pad dry-run is hard to trust.

Amit ships str_pad() in lab hour. That is the use case worth saying.

If a str_pad dry-run breaks under str_pad(), check copy-pasting str_pad without a dry-run first.

Place str_pad() next to nearby PHP work — one str_pad step Amit can write from memory is the link.

Viva for str_pad(): what it is → one str_pad step Amit can write from memory → the mistake (copy-pasting str_pad without a dry-run).

Exam tip

Board: a str_pad dry-run. Dry-run str_pad(). Name the trap: copy-pasting str_pad without a dry-run.

Example

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

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

Short notes

Defstr_pad() — Amit uses it for a str_pad dry-run in lab hour.
Rulestr_pad() → one str_pad step Amit can write from memory.
Rememberstr_pad() + a .php page (lab hour).
Usestr_pad() in lab hour (a str_pad dry-run).
Trapstr_pad() — copy-pasting str_pad without a dry-run.
Exstr_pad() → a str_pad dry-run.

str_pad()

Example

Short notes

Questions

str_pad()

Example

Short notes

Questions