PHP - is_bool

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Metóda - is_bool

(PHP 4, PHP 5, PHP 7)

The is_bool() function checks whether a given value is of the boolean type.

Procedurálne

• function is_bool (mixed $var) : bool

Parametre

Názov	Dátový typ	Predvolená hodnota	Popis
$var	mixed		A value/variable to be checked.

Mávratovej hodnoty

Vracia: bool

Returns true if the value is of the boolean type, false otherwise.

Príklady

<?php
$a = true;
$b = 0;
$c = null;
$d = 'false';

if (is_bool($a)) {
    echo 'The variable $a is boolean';
} else {
    echo 'The variable $a is not boolean';
}
echo '<br />';

if (is_bool($b)) {
    echo 'The variable $b is boolean';
} else {
    echo 'The variable $b is not boolean';
}
echo '<br />';

if (is_bool($c)) {
    echo 'The variable $c is boolean';
} else {
    echo 'The variable $c is not boolean';
}
echo '<br />';

if (is_bool($d)) {
    echo 'The variable $d is boolean';
} else {
    echo 'The variable $d is not boolean';
}