Why does "true" output 1, but "false" output nothing?

Why does "true" output 1, but "false" output nothing? & Lt ;? Php $ atrue; echo & nbsp; output below & nbsp; true & nbsp; & lt; br & gt; echo & nbsp; $ a; echo & nbsp; & lt; br & gt; $ afalse; echo & nbsp; below output & nbsp; false & nb why true output 1, but false output nothing?

 
$ A = true;

Echo "output below true
";

Echo $;

Echo'
';

$ A = false;

Echo "output below false
";

Echo $;
?>

If it is actually converted to 1 output, then false should be converted to 0 output.
------ Solution --------------------
According to its rules, this is programming.
------ Solution --------------------
$ A = false;
Var_dump ($ );

Output:
Bool (false)

We recommend that you use var_dump () for debugging.
------ Solution --------------------
The author of the language writes this statement. when you write a language one day, "false" outputs 0 and "true" outputs nothing. then someone asks why "false" outputs 0 and "true" outputs nothing.
------ Solution --------------------
Php Boolean values true and false; // echo true; 1 echo false no output content
Like php and c, 0 indicates false; non-0 indicates true;

$ A = 1;

Echo "output below true
";

Echo $;

Echo'
';

$ A = 0;

Echo "output below false
";

Echo $;

------ Solution --------------------
For numeric types, false is indeed 0, and for string, false is null. although the number 0 is equal to the string Null, it cannot be said that bool is 0 After string conversion;

var_dump((int)false);
var_dump((string)false);

------ Solution --------------------
Reference:

The author of the language writes this statement. when you write a language one day, "false" outputs 0 and "true" outputs nothing. then someone asks why "false" outputs 0 and "true" outputs nothing.

..........