PHP Comments

How it works

Use // for a short comment and /* ... */ for a block. Avoid narrating every assignment: names and small methods usually explain those operations better. For a lending desk, a comment explaining why damaged stock is excluded is more useful than a comment saying that subtraction subtracts. Comments do not validate an assumption at runtime; important rules still need executable checks and tests.

Run it locally

Run this complete source locally with PHP 8.2 or newer. Save it using the filename shown and run the command below. PHP is not currently available in Bhylu’s browser playground. Apache and MySQL are not needed for an ordinary CLI example.

php -l comments.php
php comments.php

Download this source as a local PHP lab file. Keep lab files separate from the Bhylu project and production data.

Example

<?php
declare(strict_types=1);

$stock = 9;
// Two damaged tools must not be offered for borrowing.
$unusable = 2;
/* This count excludes damaged stock, not existing loans. */
$serviceable = $stock - $unusable;
echo $serviceable, "\n";

Expected result

7

The comments identify what the second count represents and what the result excludes. That boundary matters: this code does not yet subtract active loans. A reader can now decide whether serviceable is the correct input to a later availability calculation. If the meaning changes, update the comment alongside the calculation and its tests.