(PHP 4, PHP 5, PHP 7, PHP 8)

is_bool Comprueba si una variable es de tipo booleano


is_bool(mixed $var): bool

Obtiene si la variable dada es un booleano.



La variable a ser evaluada.

Valores devueltos

Devuelve true si var es un boolean, false de lo contrario.


Ejemplo #1 Ejemplos de is_bool()

= false;
$b = 0;

// Ya que $a es un booleano, devolverá true
if (is_bool($a) === true) {
"Sí, este es un booleano";

// Ya que $b no es un booleano, devolverá false
if (is_bool($b) === false) {
"No, este no es un booleano";

Ver también

  • is_float() - Comprueba si el tipo de una variable es float
  • is_int() - Comprueba si el tipo de una variable es integer
  • is_string() - Comprueba si una variable es de tipo string
  • is_object() - Comprueba si una variable es un objeto
  • is_array() - Comprueba si una variable es un array

add a note

User Contributed Notes 2 notes

5 years ago
It should be stated that this function returns true if the _type_ of it's argument is boolean. It does not convert or coerce the value to a boolean type, not sure why so many comments focus on how to do this.
However, if you arrived here looking for a solution to convert a value to a boolean type, use this:

to_bool($x) { return (bool)$x; }
Julio Marchi
4 years ago
To check if a variable is boolean is one thing, to evaluate if the value of a variable represents a boolean condition (true or false) is another.

Here is a simple function that checks the status of the received variable in regard to boolean equivalencies (case-insensitive).

* Check "Booleanic" Conditions :)
* @param [mixed] $variable Can be anything (string, bol, integer, etc.)
* @return [boolean] Returns TRUE for "1", "true", "on" and "yes"
* Returns FALSE for "0", "false", "off" and "no"
* Returns NULL otherwise.
function is_enabled($variable)
if (!isset(
$variable)) return null;

Of course, it is a simplistic approach, but for the majority of cases it will do the job right.

And, just to put the thing from the right perspective, here's a real function that does what Phill disclosed:

* Convert $variable to boolean (adapted from Phill answer)
* @param [mixed] $variable Can be anything
* @return [boolean] Returns the booelan equivalent to $variable based on Zend Enegine interpretation
function to_bool($variable)
return (bool)

I hope it helps someone. Happy coding.
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