‘At’ symbol before variable name in PHP: @$_POST

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The @ is the 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 the $_POST array, the hn key is not set; it will throw an E_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 an E_NOTICE error:

error_reporting(E_ALL ^ E_NOTICE);

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