Octal Integer¶
Integers can be specified in octal (base 8) notation. Octal integer syntax starts with 0o (zero-o) and only contains digits from 0 to 7.
Initially, octal integers were formatted by simply starting with a initial 0. This features is still available, yet should be replaced with the less confusing syntax with 0o.
<?php
// 12
$octal = 0O14;
$octal = 014;
?>
See also PHP 8.1: Explicit Octal numeral notation
Related : integer, Binary Integer, Hexadecimal Integer