Variables and types
Variables start with $; int, float, string, bool, null, arrays; strict comparison and conversions.
Runs in Zerethon IDE · PHP 8.4
Official PHP documentation ↗
main.php
<?php
$count = 3;
$price = 9.5;
$name = 'Ada';
$ready = true;
$nothing = null;
echo gettype($count), ' ', gettype($price), ' ', gettype($name), ' ', gettype($ready), ' ', gettype($nothing), "\n";
echo "$name costs {$price}\n";
echo 7 / 2, ' ', intdiv(7, 2), ' ', 7 % 2, ' ', 2 ** 10, "\n";
echo (int) '42' + 1, ' ', (float) '2.5' * 2, ' ', (string) 7 . '7', "\n";
var_dump('1' == 1, '1' === 1, 0 == 'a');Output
integer double string boolean NULL Ada costs 9.5 3.5 3 1 1024 43 5 77 bool(true) bool(false) bool(false)
- Use
===/!==(type and value).==converts types first. /gives a float when the result is not whole;intdiv()is whole-number division.var_dump()shows type and value — the quickest way to inspect something.- Add
declare(strict_types=1);at the top of a file to stop scalar type conversion in function calls.