PHP intval function

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intval

(PHP 3, PHP 4, PHP 5)

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

The scalar value being converted to an integer

The base for the conversion (default is base 10)

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.

Example 1. intval() examples

The following examples are based on a 32 bit system.

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

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