Руководство по PHP
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# intval

(PHP 3, PHP 4, PHP 5)

intval -- Get the integer value of a variable

## Описание

int intval ( mixed var [, int base] )

Returns the integer value of `var`, using the specified `base` for the conversion (the default is base 10).

## Список параметров

`var`

  The scalar value being converted to an integer

`base`

  The base for the conversion (default is base 10)

## Возвращаемые значения

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

## Примеры

Пример 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
?>`

## Примечания

> Замечание: The `base` parameter has no effect unless the `var` parameter is a string.

## Смотрите также

floatval()
strval()
settype()
is_numeric()
Type juggling
BCMath Arbitrary Precision Mathematics Functions

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