is_bool() is an inbuilt function in php. The is_bool() function is used to find whether a variable is a boolean or not.
Syntax:
boolean is_bool($variable_name) $variable_name:the variable we want to check.
return value: It is a boolean function so returns TRUE when $variable_name is a boolean value, otherwise FALSE.
Example 1:
PHP
<?php //php code $variable_name1 = false;
$variable_name2 = 32;
//$variable_name1 is boolean, gives TRUE if ( is_bool ( $variable_name1 ))
echo "Variable is a boolean. \n";
else echo 'Variable is not a boolean. \n' ;
//$variable_name2 is boolean, gives FALSE if ( is_bool ( $variable_name2 ))
echo '32 is a boolean.\n' ;
else echo '32 is not a boolean.' ;
?> |
Output:
Variable is a boolean. 32 is not a boolean.
Example 2:
PHP
<?php // PHP code function square( $num )
{ return ( is_bool ( $num ));
} echo square(TRUE) ."\n"; // outputs '1'.
echo square(FALSE) ."\n"; // outputs '1'.
echo square(56) ."\n"; // nothing is returned.
?> |
Output:
1 1