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how can i link two drop down menu box where i can select one menu and it should show my list in other drop down box?

PHP, being a server side language will require the page to be refreshed (the form posted) before the value of the first selected drop down is available.

To do this without a page refresh, you will need to do so on the client side, using JavaScript. If the list is generated via PHP then you should look into AJAX.

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