Compzone.Org :: Podręcznik PHP :: intval

Podręcznik PHP
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intval

(PHP 3, PHP 4, PHP 5)

intval -- Get the integer value of a variable

Opis

int intval ( mixed var [, int base] )

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

Parametry

var: The scalar value being converted to an integer
base: The base for the conversion (default is base 10)

Zwracane wartości

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.

Przykłady

Przykład 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

                ?>

Notatki

Notatka: The base parameter has no effect unless the var parameter is a string.

Patrz także

floatval()

strval()

settype()

is_numeric()

Type juggling

BCMath Arbitrary Precision Mathematics Functions

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