What function of @ in PHP ???

Wahyu Raja Butar-Butar Reply 11:00
That is Error Handling.

The @ is error suppression operator in PHP.
PHP supports one error control operator: the at sign (@). When prepended to an expression in PHP, any error messages that might be generated by that expression will be ignored.
See:

Update:

In your example, it is used before the variable name to avoid the E_NOTICE error there. If in $_POSTarray, hn key is not set, it will throwE_NOTICE message but @ is used there to avoid that E_NOTICE.
Note that you can also put this line on top of your script to avoid E_NOTICE error:
error_reporting(E_ALL ^ E_NOTICE);

PHP6 Note:

Because @ operator is very slow, it won't work on ini_set eg @ini_set.
You should avoid using it where you can.
Source : http://stackoverflow.com/questions/3551527/php-at-symbol-before-variable-name-post

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