PHP · Theory

substr_count()

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Theory

268/352

substr_count()

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

For substr_count(), a .php page is in play. Don’t blame it until you have traced a substr_count dry-run.

substr_count() exists so Zara can keep a substr_count dry-run correct in a first job task.

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

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

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

One breath for substr_count(), then a substr_count dry-run, then only reciting the name of substr_count. Sit down.

Exam tip

Board: a substr_count dry-run. Dry-run substr_count(). Name the trap: only reciting the name of substr_count.

Example

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

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

Short notes

Defsubstr_count() — Zara uses it for a substr_count dry-run in a first job task.
Rulesubstr_count() → one substr_count step Zara can write from memory.
Remembersubstr_count() + a .php page (a first job task).
Usesubstr_count() in a first job task (a substr_count dry-run).
Trapsubstr_count() — only reciting the name of substr_count.
Exsubstr_count() → a substr_count dry-run.

PHP · Theory

substr_count()

← All stacks

Theory

268/352

substr_count()

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

For substr_count(), a .php page is in play. Don’t blame it until you have traced a substr_count dry-run.

substr_count() exists so Zara can keep a substr_count dry-run correct in a first job task.

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

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

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

One breath for substr_count(), then a substr_count dry-run, then only reciting the name of substr_count. Sit down.

Exam tip

Board: a substr_count dry-run. Dry-run substr_count(). Name the trap: only reciting the name of substr_count.

Example

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

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

Short notes

Defsubstr_count() — Zara uses it for a substr_count dry-run in a first job task.
Rulesubstr_count() → one substr_count step Zara can write from memory.
Remembersubstr_count() + a .php page (a first job task).
Usesubstr_count() in a first job task (a substr_count dry-run).
Trapsubstr_count() — only reciting the name of substr_count.
Exsubstr_count() → a substr_count dry-run.

substr_count()

Example

Short notes

Questions

substr_count()

Example

Short notes

Questions