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 TRUEif (is_bool($variable_name1))echo "Variable is a boolean. \n";elseecho 'Variable is not a boolean. \n';//$variable_name2 is boolean, gives FALSEif (is_bool($variable_name2))echo '32 is a boolean.\n';elseecho '32 is not a boolean.';?> |
Output:
Variable is a boolean. 32 is not a boolean.
Example 2:
PHP
<?php// PHP codefunction square($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
