PHP · Theory

trim()

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Theory

270/352

trim()

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

Keep trim() small. Sara should finish a trim dry-run in a few lines, not a 40-line dump.

Skip trim() and only reciting the name of trim shows up in a small live site.

Sara ships trim() in a small live site. That is the use case worth saying.

Don’t do this with trim() — only reciting the name of trim. Interviewers spot it in ten seconds.

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

Viva for trim() — what it is → one trim step Sara can write from memory → the mistake (only reciting the name of trim).

Exam tip

Say trim() in one breath, then one trim step Sara can write from memory, then only reciting the name of trim.

Example

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

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

Short notes

Deftrim() — Sara uses it for a trim dry-run in a small live site.
Ruletrim() → one trim step Sara can write from memory.
Remembertrim() + the PHP runtime (a small live site).
Usetrim() in a small live site (a trim dry-run).
Traptrim() — only reciting the name of trim.
Extrim() → a trim dry-run.

PHP · Theory

trim()

← All stacks

Theory

270/352

trim()

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

Keep trim() small. Sara should finish a trim dry-run in a few lines, not a 40-line dump.

Skip trim() and only reciting the name of trim shows up in a small live site.

Sara ships trim() in a small live site. That is the use case worth saying.

Don’t do this with trim() — only reciting the name of trim. Interviewers spot it in ten seconds.

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

Viva for trim() — what it is → one trim step Sara can write from memory → the mistake (only reciting the name of trim).

Exam tip

Say trim() in one breath, then one trim step Sara can write from memory, then only reciting the name of trim.

Example

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

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

Short notes

Deftrim() — Sara uses it for a trim dry-run in a small live site.
Ruletrim() → one trim step Sara can write from memory.
Remembertrim() + the PHP runtime (a small live site).
Usetrim() in a small live site (a trim dry-run).
Traptrim() — only reciting the name of trim.
Extrim() → a trim dry-run.

trim()

Example

Short notes

Questions

trim()

Example

Short notes

Questions