Username availability checker with PHP and jquery

Do you want to tell users while registering if the username they have typed into input field is available or is taken already before they submit the form? Well, it can be easily done with PHP and jquery, it takes no more than few lines.
Username availability checker with php and jquery

 First set a HTML form like this and save it as form.html

Do not forget to attach jQuery script, because it is where the magic lies

Now set up the php page, it is the place where the username availability will be checked

Code goes like this

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