PHP · Theory

ltrim()

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Theory

207/352

ltrim()

Ananya only reaches for ltrim() when a ltrim dry-run has to stay correct in a small live site.

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

Without ltrim(), a small live site gets messy and a ltrim dry-run is hard to trust.

ltrim() shows up in a small live site. Name a ltrim dry-run, not “a real-world scenario”.

ltrim() trap — skipping the failure case for ltrim. Ananya loses marks for that every viva.

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

Close ltrim() with — “If I skip it, a ltrim dry-run goes wrong like this: skipping the failure case for ltrim.”

Exam tip

For ltrim(): definition + a small live site + one failure.

Example

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

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

Short notes

Defltrim() — Ananya uses it for a ltrim dry-run in a small live site.
Ruleltrim() → one ltrim step Ananya can write from memory.
Rememberltrim() + Apache/Nginx (a small live site).
Useltrim() in a small live site (a ltrim dry-run).
Trapltrim() — skipping the failure case for ltrim.
Exltrim() → a ltrim dry-run.

PHP · Theory

ltrim()

← All stacks

Theory

207/352

ltrim()

Ananya only reaches for ltrim() when a ltrim dry-run has to stay correct in a small live site.

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

Without ltrim(), a small live site gets messy and a ltrim dry-run is hard to trust.

ltrim() shows up in a small live site. Name a ltrim dry-run, not “a real-world scenario”.

ltrim() trap — skipping the failure case for ltrim. Ananya loses marks for that every viva.

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

Close ltrim() with — “If I skip it, a ltrim dry-run goes wrong like this: skipping the failure case for ltrim.”

Exam tip

For ltrim(): definition + a small live site + one failure.

Example

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

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

Short notes

Defltrim() — Ananya uses it for a ltrim dry-run in a small live site.
Ruleltrim() → one ltrim step Ananya can write from memory.
Rememberltrim() + Apache/Nginx (a small live site).
Useltrim() in a small live site (a ltrim dry-run).
Trapltrim() — skipping the failure case for ltrim.
Exltrim() → a ltrim dry-run.

ltrim()

Example

Short notes

Questions

ltrim()

Example

Short notes

Questions