PHP Functions Essential Reference

is_double

bool is_double(mixed value) 

Tests whether a value is a double.

Returns:

TRUE if the value is a double; FALSE otherwise

Description:

is_double() checks whether value is a double. If so, the function returns TRUE. If not, FALSE is returned.

Availability:

UNIX, Windows

Version:

3+, 4+

See also:

gettype() 

Example:

Test whether a value is a double

$value = 3000000000; // Note that the value contained in $value is larger what can usually be stored // in an integer. if (is_double ($value)) print 'Value $value is a double.'; else print 'Value $value is not a double.';