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    is_bool

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

    is_bool — Comprueba si una variable es de tipo booleano

    Descripción

    is_bool(mixed $var): bool

    Obtiene si la variable dada es un booleano.

    Parámetros

    var

    La variable a ser evaluada.

    Valores devueltos

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

    Ejemplos

    Ejemplo #1 Ejemplos de is_bool()

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

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

    // Ya que $b no es un booleano, devolverá false
    if (is_bool($b) === false) {
    echo     "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 3 notes

    up
    9
    Julio Marchi
    3 years ago
    The function Michael Smith published doesn't do the work as it should.

    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 a simple function that checks the status of the received variable in regards 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 thing in 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.
    up
    10
    phil
    4 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
    -21
    Michael Smith
    9 years ago
    The function in the last comment also converts the string 'false' to a true boolean. Here's a function that does what I think was intended:

    <?php
    function toBool($var) {
      if (!    is_string($var)) return (bool) $var;
      switch (    strtolower($var)) {
        case     '1':
        case     'true':
        case     'on':
        case     'yes':
        case     'y':
          return     true;
        default:
          return     false;
      }
    }
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