html 5 input type email $

i have code like this,

<input id="email" name="email" type="email" placeholder="email" class="form-control input-md" required="" />

and my action form php $email=$_POST["email"]; when i type echo $email, it not showing what i input. but if i change

    <input id="email" name="email" type="text" placeholder="email" class="form-control input-md" required="" /> (type=text)

it show what i input , with type text, but not type = email , why? thanks

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