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is_bool

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

is_bool Determina si una variable es un bool

Descripción

is_bool(mixed $value): bool

is_bool() determina si la variable dada es un bool.

Parámetros

value

La variable a evaluar.

Valores devueltos

Retorna true si value es un booleano, false en caso contrario.

Ejemplos

Ejemplo #1 Ejemplo con is_bool()

<?php
$a
= false;
$b = 0;

// Si $a es un bool, is_bool retornará true
if (is_bool($a) === true) {
echo
"Sí, es un bool.\n";
}

// Si $b no es un bool, is_bool retornará false
if (is_bool($b) === false) {
echo
"No, no es un bool.\n";
}
?>

Ver también

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

add a note

User Contributed Notes 2 notes

up
12
phil
6 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; }
up
11
Julio Marchi
6 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).

<?php
/** 
 * 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($variable)) return null;
    return filter_var($variable, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE);
}
?>

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:

<?php
/** 
 * 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)$variable;
}
?>

I hope it helps someone. Happy coding.
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