is_double()

is_double() — Alias of is_float().

Built-in function of PHP 8.5. The manual lists it as available in PHP 4, PHP 5, PHP 7, PHP 8. This page is the reference card: signature, parameters and return value, plus the changelog and the example the manual provides.

is_double() is an alias of is_float(): same parameters, same return value.

Signature

is_double(mixed $value): bool

Parameters

Return value

Returns true if value is a float, false otherwise.

Example

A runnable snippet:

var_dump(is_float(27.25)); var_dump(is_float('abc')); var_dump(is_float(23)); var_dump(is_float(23.5)); var_dump(is_float(1e7)); //Scientific Notation var_dump(is_float(true));

Output:

bool(true) bool(false) bool(false) bool(true) bool(true) bool(false)

All PHP 8.5 built-in functions

Reference card built from the PHP manual page is_double() (PHP documentation, CC BY 3.0). The page is generated from the manual, so the wording of the parameter and return value text follows php.net.