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intval

Podręcznik PHP
Poprzedni		Następny

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 ?>