PHP function intval()

Availability in versions: `PHP 5.5.0 / function boolval($var) {}

/** Get the integer value of a variable, PHP 4.0`

(PHP 5.5.0)
Get the boolean value of a variable

Parameters

Parameter	Data type	Default value	Note
$var	mixed	not	the scalar value being converted to a boolean.
$base	int	null	The base for the conversion

Return values

• boolean The boolean value of var.
• int 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('10000000000000000') 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.

Other resources

Official intval documentation