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(PHP 4, PHP 5)

is_float — Finds whether the type of a variable is float

bool is_float( $var )

Parameters

$var

The variable being evaluated.

Returns TRUE if var is an float, FALSE otherwise.

Note:
To test if a variable is a number or a numeric string (such as form input, which is always a string), you must use is_numeric().

Example:

if (is_float(27.25)) {
    echo "is float\n";
} else {
    echo "is not float\n";
}
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));

The above example will output:

is float
bool(false)
bool(false)
bool(true)
bool(true)
bool(false

See Also:

is_bool() – Finds out whether a variable is a boolean
is_int() – Find whether the type of a variable is integer
is_numeric() – Finds whether a variable is a number or a numeric string
is_string() – Find whether the type of a variable is string
is_array() – Finds whether a variable is an array
is_object() – Finds whether a variable is an object

To see more:
http://php.net/manual/en/function.is-array.php