Boolean Type of PHP Manual

PHP's boolean type has only two values: true and false. And the two values areCase Insensitive.

If you want to convert other values to the bool type, you can use (bool) or (Boolean) for conversion.

When converting to bool, the following values are converted to false:

1. boolean type: false;

2. Integer type 0;

3. Float Type: 0.0;

4. Empty string "" and string "0 ";

5. Empty array ();

6. A null variable;

7,Simplexml objects created from empty tags;

All other types are converted to true.

Note the following:

1. String "0.0", string "false", "null ";

2. integer-1;