Simple E-mail Validation in PHP using JavaScript(jQuery). generally we do validations by two ways. Client-side Server-side 1. Client -Side : We have to verify that the user entered data is an email. But we can do this by using JavaScript or  jQuery.  Here is the code to validate email. Here is the html first. <form method="post"> <input type="text" name="user_email" value="" onChange="kv_validateEmail(this)"> </form> And here is ...