Numbers & casts in PHP

Integer and float arithmetic, plus the casts that tame loose strings.

<?php
$price = 19.99;
$qty = 3;

echo $price * $qty, PHP_EOL;
echo intdiv(17, 5), " remainder ", 17 % 5, PHP_EOL;

// casts are explicit and forgiving: leading digits parse, the rest drops
var_dump((int) "42 items");
var_dump((float) "3.14");
var_dump((int) $price);
echo round($price), " ", floor($price), " ", ceil($price), PHP_EOL;

How it works

1. intdiv divides toward zero while % keeps the remainder.
2. (int) and (float) casts parse leading digits and drop the rest.
3. Casting 19.99 to int truncates; round, floor, and ceil choose the direction.

Keywords and builtins used here

• ceil
• echo
• floor
• intdiv
• round
• var_dump

The run, in numbers

Lines

12

Characters to type

334

Tokens

77

Three-star pace

80 tpm

At the three-star pace of 80 tokens a minute, this run takes about 58 seconds.

Type this snippet

Step 3 of 3 in Variables & types, step 3 of 27 in Language basics.

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Numbers & casts in other languages

• C#
• Java