What function of @ in PHP ???
That is Error Handling.
The
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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