is_bool()

(PHP 4, PHP 5, PHP 7)

检测变量是否是布尔型

描述

如果$var是boolean则返回TRUE。

Example #1is_bool()示例

参见is_array()、is_float()、is_int()、is_integer()、is_string()和is_object()。

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; }

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).