shellexecuteex fails. Use window_onload to implement select default selection.

Please refer to this program:
//$day Day of the week, such as: Wednesday
$day=3;
?>






'">

Monday
Tuesday

Thursday
Friday
Saturday
Sunday

By analogy, window_onload can be used to select some default items
I hope it will be helpful to everyone
Please accept it.
The above introduces the failure of shellexecuteex. Use window_onload to implement the default selection of select, including the failure of shellexecuteex. I hope it will be helpful to friends who are interested in PHP tutorials.