PHP · Theory

substr_compare()

Theory

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substr_compare()

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

substr_compare() order: meaning → one substr_compare step Zara can write from memory → one limit. Dumping ten features helps nobody.

Without substr_compare(), a first job task gets messy and a substr_compare dry-run is hard to trust.

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

If a substr_compare dry-run breaks under substr_compare(), check copy-pasting substr_compare without a dry-run first.

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

Viva for substr_compare(): what it is → one substr_compare step Zara can write from memory → the mistake (copy-pasting substr_compare without a dry-run).

Exam tip

For substr_compare(): definition + a first job task + one failure.

Example

<?php
// substr_compare()
$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_compare(): scores array, print avg, then high marks. Say the output.

Short notes

Defsubstr_compare() — Zara uses it for a substr_compare dry-run in a first job task.
Rulesubstr_compare() → one substr_compare step Zara can write from memory.
Remembersubstr_compare() + Apache/Nginx (a first job task).
Usesubstr_compare() in a first job task (a substr_compare dry-run).
Trapsubstr_compare() — copy-pasting substr_compare without a dry-run.
Exsubstr_compare() → a substr_compare dry-run.

<?php // substr_compare() $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_compare()

Example

Short notes

Questions

substr_compare()

Example

Short notes

Questions