PHP intval() function

Author：Eve Cole Update Time：2024-12-29 12:48:01

The intval() function is used to get the integer value of a variable.

The intval() function returns the integer value of the variable var by using the specified base conversion (default is decimal). intval() cannot be used for object, otherwise an E_NOTICE error will be generated and 1 will be returned.

PHP 4, PHP 5, PHP 7

grammar

 int intval ( mixed $var [, int $base = 10 ] )

Parameter description:

$var: The quantity value to be converted to integer.

$base: The base used for conversion.

If base is 0, the base used is determined by checking the format of var:

If the string includes the "0x" (or "0X") prefix, use hexadecimal (hex); otherwise,

If the string starts with "0", use octal; otherwise,

Decimal will be used.

return value

Returns the integer value of var on success and 0 on failure. An empty array returns 0, a non-empty array returns 1.

The maximum value depends on the operating system. The maximum signed integer range on 32-bit systems is -2147483648 to 2147483647. For example, on such a system, intval('1000000000000') would return 2147483647. On a 64-bit system, the maximum signed integer value is 9223372036854775807.

It is possible for strings to return 0, although this depends on the leftmost character of the string.

Example

<?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 ( 1 e10 ) ; // 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 echo intval ( array ( ) ) ; // 0 echo intval ( array ( ' foo ' , ' bar ' ) ) ; // 1 ?>