PHP is_float() Function
Quick summary: The PHP is_float() function checks whether a variable is of type float.
PHP is_float() Syntax
is_float(mixed $value): boolPHP
PHP is_float() Basic examples
var_dump(is_float(1.5));PHP
Output:
bool(true)Returns true for float values.
var_dump(is_float(1));PHP
Output:
bool(false)Integers are not floats.
PHP is_float() Real-world usage
$price = 9.99;
if (is_float($price)) {
echo 'Float price';
}PHP
Output:
Float priceValidates floating-point values.
PHP is_float() Edge cases
var_dump(is_float(NAN));PHP
Output:
bool(true)NAN is considered a float.
PHP is_float() Common mistakes
Expecting numeric strings to be floats
is_float checks strict type.
Incorrect
is_float("1.5");Correct
is_numeric("1.5");Use is_numeric to validate numeric strings.
PHP is_float() Frequently Asked Questions
What does is_float() do?
Checks if a variable is float.
Alias?
is_double().
Use case?
Decimal validation.
Handles numeric strings?
No.
Common mistake?
Using with strings.
Return type?
bool.
Strict?
Yes.
Alternative?
is_numeric().
Performance?
Fast.
Safe?
Yes.
Handles ints?
No.
Best practice?
Validate numeric input.