[b]PHP代码
[/b]$id = intval($_GET['id']);
[b]intval
[/b](PHP 4, PHP 5)
intval — Get the integer value of a variable
[b]Description[/b]
int intval ( mixed $var [, int $base= 10 ] )
Returns the integer value of var , using the specified base for the conversion (the default is base 10).
Parameters
[b]var
[/b]The scalar value being converted to an integer
[b]base
[/b]The base for the conversion (default is base 10)
[b]Return Values
[/b]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.
[b]Examples
[/b]
<?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
?>
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