There is a list of options in my website home page – for example, http://example.com. When a user clicks on option1, I want to show the URL as http://option1.example.com and not http://example.com/xyz.php?opt=option1. Any help or guidance would be appreciated.
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You will either need to create a subdomain for each option and then provide the required code at that subdomain. how you set that up varies by hosting provider.
Do you really need a seperate subdomain per option?
Could you use
http://abc.ca/Option1/orhttp://abc.ca/Options/1/instead?If not you will need to contact your hosting providers about creating subdomains option1.abc.ca etc and where to put your php pages.
If you are hosting your own server with apache, I think it is possible to use a * dns entry to accept all subdomains and then you can use $_SERVER variables to get the domain being requested.