How PHP implements weak Variables

How PHP implements weak Variables

PHP Variables

Zval definition;

$ A = 1;

$ B = $;

There is only one zval. If you write another $ B = 2, a new variable will appear. This is calledBytes
On write

 

$ A = 1;

$ B = $;

$ C = $ B;

And the changes after adding $ d = & $ C

 

$ A = 1;

$ B = & $;

$ C = & $ B;

Added the change after $ B = $ C.

Therefore, PHP does not encourage reference;

 

Strlen is O (1), not O (N );

Can PHP Strings contain/0?
Allow, and automatically add/0 at the end;

PHP integers are automatically converted to the double type after they are out of the range.