PHP · Theory

strtr()

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Theory

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strtr()

Ananya only reaches for strtr() when a strtr dry-run has to stay correct in a viva board.

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

Without strtr(), a viva board gets messy and a strtr dry-run is hard to trust.

Use strtr() when a strtr dry-run must stay clear. If a simpler PHP step works, use that instead.

Don’t do this with strtr() — copy-pasting strtr without a dry-run. Interviewers spot it in ten seconds.

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

Close strtr() with — “If I skip it, a strtr dry-run goes wrong like this: copy-pasting strtr without a dry-run.”

Exam tip

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

Example

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

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

Short notes

Defstrtr() — Ananya uses it for a strtr dry-run in a viva board.
Rulestrtr() → one strtr step Ananya can write from memory.
Rememberstrtr() + a .php page (a viva board).
Usestrtr() in a viva board (a strtr dry-run).
Trapstrtr() — copy-pasting strtr without a dry-run.
Exstrtr() → a strtr dry-run.

PHP · Theory

strtr()

← All stacks

Theory

265/352

strtr()

Ananya only reaches for strtr() when a strtr dry-run has to stay correct in a viva board.

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

Without strtr(), a viva board gets messy and a strtr dry-run is hard to trust.

Use strtr() when a strtr dry-run must stay clear. If a simpler PHP step works, use that instead.

Don’t do this with strtr() — copy-pasting strtr without a dry-run. Interviewers spot it in ten seconds.

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

Close strtr() with — “If I skip it, a strtr dry-run goes wrong like this: copy-pasting strtr without a dry-run.”

Exam tip

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

Example

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

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

Short notes

Defstrtr() — Ananya uses it for a strtr dry-run in a viva board.
Rulestrtr() → one strtr step Ananya can write from memory.
Rememberstrtr() + a .php page (a viva board).
Usestrtr() in a viva board (a strtr dry-run).
Trapstrtr() — copy-pasting strtr without a dry-run.
Exstrtr() → a strtr dry-run.

strtr()

Example

Short notes

Questions

strtr()

Example

Short notes

Questions