Binary Integer
Integers can be specified in binary, or base 2, notation. Binary integer syntax starts with the prefix 0b and only contains 0 and 1.
Binary integers may be specified as positive or negative. Their size may become very long, and yet, eventually, produce an integer. They may have leading 0, after the prefix 0b.
Binary format exists only at compilation time: at execution time, the integer is in decimal form and has no hint that it was input as a binary number.
Binary numbers are integers until PHP_INT_MAX. Beyond that, they are cast into a decimal number, float, and eventually, are returned as INF.
It is possible to use decbin() and sprintf(), related functions to produce a string representation in the binary format.
<?php
// 12
$binary = 0b1100;
// On a 32bit machine (double the size for 64bits one)
$binary = 0b1111111111111111111111111111111;
?>