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intval
Manuál PHP
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intval

(PHP 3, PHP 4, PHP 5)

intval -- Get the integer value of a variable

Popis

int intval ( mixed var [, int base] )

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

Seznam parametrů

var

The scalar value being converted to an integer

base

The base for the conversion (default is base 10)

Návratové hodnoty

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.

Příklady

Příklad 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
?>

Poznámky

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

Viz také

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

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