Get the integer value of a variable (original) (raw)

intval

(PHP 4, PHP 5, PHP 7)

intval — Get the integer value of a variable

Description

intval ( mixed $var [, int $base = 10 ] ) : int

Parameters

var

The scalar value being converted to an integer

base

The base for the conversion

Note:

If base is 0, the base used is determined by the format of var:

if string includes a "0x" (or "0X") prefix, the base is taken as 16 (hex); otherwise,

if string starts with "0", the base is taken as 8 (octal); otherwise,

the base is taken as 10 (decimal).

Return Values

The integer value of var on success, or 0 on failure. Empty arrays return 0, non-empty arrays return 1.

The maximum value depends on the system. 32 bit systems have a maximum signed integer range of -2147483648 to 2147483647. So for example on such a system, intval('1000000000000') will return 2147483647. The maximum signed integer value for 64 bit systems is 9223372036854775807.

Strings will most likely return 0 although this depends on the leftmost characters of the string. The common rules of integer casting apply.

Examples

Example #1 intval() examples

The following examples are based on a 32 bit system.

<?php echo intval(42); // 42 echo intval(4.2); // 4 echo intval('42'); // 42 echo intval('+42'); // 42 echo intval('-42'); // -42 echo intval(042); // 34 echo intval('042'); // 42 echo intval(1e10); // 1410065408 echo intval('1e10'); // 1 echo intval(0x1A); // 26 echo intval(42000000); // 42000000 echo intval(420000000000000000000); // 0 echo intval('420000000000000000000'); // 2147483647 echo intval(42, 8); // 42 echo intval('42', 8); // 34 echo intval(array()); // 0 echo intval(array('foo', 'bar')); // 1 echo intval(false); // 0 echo intval(true); // 1 ?>

Notes

Note:

The base parameter has no effect unless thevar parameter is a string.

Changelog

Version	Description
5.1.0	Throws E_NOTICE and returns 1, when an object is passed to var.