If the program is larger, referencing the same object is more variable, and you want to use the object after the manual removal of it, the personal suggestion "&" method, and then $var=null to clear.
For large arrays in php5, it is recommended to use the "&" method, after all, save memory space.
The point function of the address in PHP is not implemented by the user itself, but is implemented by the Zend Core.
PHP refers to the principle of "copy-on-write", that is, unless a write operation occurs, a variable or object that points to the same address is not copied.
When we unset a reference, we just break the binding between the variable name and the variable content, which does not mean that the contents of the variable are destroyed
You can dereference it in a $var=null way.
The above describes some of the variables in PHP, including the contents of the content, I hope that the PHP tutorial interested in a friend helpful.
