PHP · Theory

strpos()

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Theory

255/352

strpos()

strpos() is simple if you keep it on paper. Amit uses it for a strpos dry-run in a small live site.

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

strpos() exists so Amit can keep a strpos dry-run correct in a small live site.

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

If a strpos dry-run breaks under strpos(), check skipping the failure case for strpos first.

After strpos(), Amit should still remember skipping the failure case for strpos.

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

Exam tip

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

Example

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

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

Short notes

Defstrpos() — Amit uses it for a strpos dry-run in a small live site.
Rulestrpos() → one strpos step Amit can write from memory.
Rememberstrpos() + the PHP runtime (a small live site).
Usestrpos() in a small live site (a strpos dry-run).
Trapstrpos() — skipping the failure case for strpos.
Exstrpos() → a strpos dry-run.

PHP · Theory

strpos()

← All stacks

Theory

255/352

strpos()

strpos() is simple if you keep it on paper. Amit uses it for a strpos dry-run in a small live site.

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

strpos() exists so Amit can keep a strpos dry-run correct in a small live site.

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

If a strpos dry-run breaks under strpos(), check skipping the failure case for strpos first.

After strpos(), Amit should still remember skipping the failure case for strpos.

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

Exam tip

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

Example

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

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

Short notes

Defstrpos() — Amit uses it for a strpos dry-run in a small live site.
Rulestrpos() → one strpos step Amit can write from memory.
Rememberstrpos() + the PHP runtime (a small live site).
Usestrpos() in a small live site (a strpos dry-run).
Trapstrpos() — skipping the failure case for strpos.
Exstrpos() → a strpos dry-run.

strpos()

Example

Short notes

Questions

strpos()

Example

Short notes

Questions