PHP · Theory

strrchr()

Theory

256/352

strrchr()

Sara only reaches for strrchr() when strrchr on Sara's board has to stay correct in a first job task.

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

Without strrchr(), a first job task gets messy and strrchr on Sara's board is hard to trust.

Sara ships strrchr() in a first job task. That is the use case worth saying.

strrchr() trap — skipping the failure case for strrchr. Sara loses marks for that every viva.

After strrchr(), Sara should still remember skipping the failure case for strrchr.

Close strrchr() with: “If I skip it, strrchr on Sara's board goes wrong like this: skipping the failure case for strrchr.”

Exam tip

Say strrchr() in one breath, then one strrchr step Sara can write from memory, then skipping the failure case for strrchr.

Example

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

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

Short notes

Defstrrchr() — Sara uses it for strrchr on Sara's board in a first job task.
Rulestrrchr() → one strrchr step Sara can write from memory.
Rememberstrrchr() + Apache/Nginx (a first job task).
Usestrrchr() in a first job task (strrchr on Sara's board).
Trapstrrchr() — skipping the failure case for strrchr.
Exstrrchr() → strrchr on Sara's board.

PHP · Theory

strrchr()

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Theory

256/352

strrchr()

Sara only reaches for strrchr() when strrchr on Sara's board has to stay correct in a first job task.

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

Without strrchr(), a first job task gets messy and strrchr on Sara's board is hard to trust.

Sara ships strrchr() in a first job task. That is the use case worth saying.

strrchr() trap — skipping the failure case for strrchr. Sara loses marks for that every viva.

After strrchr(), Sara should still remember skipping the failure case for strrchr.

Close strrchr() with: “If I skip it, strrchr on Sara's board goes wrong like this: skipping the failure case for strrchr.”

Exam tip

Say strrchr() in one breath, then one strrchr step Sara can write from memory, then skipping the failure case for strrchr.

Example

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

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

Short notes

Defstrrchr() — Sara uses it for strrchr on Sara's board in a first job task.
Rulestrrchr() → one strrchr step Sara can write from memory.
Rememberstrrchr() + Apache/Nginx (a first job task).
Usestrrchr() in a first job task (strrchr on Sara's board).
Trapstrrchr() — skipping the failure case for strrchr.
Exstrrchr() → strrchr on Sara's board.

strrchr()

Example

Short notes

Questions

strrchr()

Example

Short notes

Questions