intval

(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

import_request_variables

is_array

Variable handling Функции