shellexecutehooks combines use of javascript and select components

//Combined use of Javascript and select components
//In the process of writing the program, I want to realize that after selecting the option in the select object,
//No need to submit the button, but directly trigger the action, and in the action After this happens
// the selected options should be kept on the page. After describing it, I finally realized this function by
//using Javascript and the onchange attribute of the select object and
//value.
//The code is as follows (the file name is "test.php"):
switch ($mon){
case '': echo 'Please select your zodiac sign:';break;
case '1':echo 'your Your zodiac sign is Aquarius';break;
case '2':echo 'Your zodiac sign is Pisces';break;
case '3':echo 'Your zodiac sign is Aries';break;
case '4':echo ' Your zodiac sign is Taurus';break;
case '5':echo 'Your zodiac sign is Gemini';break;
case '6':echo 'Your zodiac sign is Cancer';break;
case '7':echo 'Your zodiac sign is Leo';break;
 case '8':echo 'Your zodiac sign is Virgo';break;
 case '9':echo 'Your zodiac sign is Libra';break;
 case '10 ':echo 'Your zodiac sign is Scorpio';break;
 case '11':echo 'Your zodiac sign is Sagittarius';break;
 case '12':echo 'Your zodiac sign is Capricorn';break;
default:break;
? value">

>Aquarius
>Pisces
>Aries< ;/option>
>Taurus
>Gemini
  >Cancer
>Leo
  >Virgo
                                                                                                                                                                    ?php if($mon=="10") echo "selected"; ?>>Scorpio
>Sagittarius
>Capricorn


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The above introduces the use of shellexecutehooks on the combination of javascript and select components, including the content of shellexecutehooks. I hope it will be helpful to friends who are interested in PHP tutorials.