integer¶

An integer, or 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)

?>

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integer¶

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