integer¶
An int is a number of the set ℤ = {…, -2, -1, 0, 1, 2, …}. It is limited by PHP_INT_MIN (lower bound) and PHP_INT_MAX (upper bound).
Integers have several syntaxes : they may be written in binary, octal, decimal, hexadecimal and with _ as a separator.
<?php
$a = 1234; // decimal number
$a = 0123; // octal number (equivalent to 83 decimal)
$a = 0o123; // octal number (as of PHP 8.1.0)
$a = 0x1A; // hexadecimal number (equivalent to 26 decimal)
$a = 0b11111111; // binary number (equivalent to 255 decimal)
$a = 1_234_567; // decimal number (as of PHP 7.4.0)
?>
Related : Addition