how can i create short code for custom form for my website using PHP, wordpress,HTML,CSS?

i would like to add a custom form to my website , by making short code.
do i need to include that in function.php?
vishnu kalakotaAsked:
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You could do that, but the proper way would be to create a plugin.
Michael is correct.  Here is a tutorial: There are also a bunch of other tutorials on the internet.  BUT placing it in the functions.php file will work just fine, as long as the function.php file is in your theme directory.
If you want to use your theme to do it, here's an example and yes, it just goes in the functions.php file of the theme:

function add_contact_form() {
	$content = ' 
		First name:<br>
		<input type="text" name="firstname">
		Last name:<br>
		<input type="text" name="lastname">
	return $content;

add_shortcode( 'custom_contact_form', 'add_contact_form' );

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vishnu kalakotaAuthor Commented:
Great.. Thanks
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