mailchimp auto pre filled url encoding - php

Question

how to pre fill my subscription forum with email.for example if some one want to enter his "email" and click "senden" button for subscription, his "Email" should already be there in my subscription forum. down is the urls from website(for embedded subscription forum), code of this embedded widget and subscription forum.
mail chimp subscription forum url: http://boooo.us7.list-manage.com/subscribe?u=2e01f07a729f6f76a41a34ca5&id=66efb8b1bb
website url: www.boooo.com
code:
<!-- Begin MailChimp Signup Form -->
<div id="mc_embed_signup">
<form action="//eepurl.com/-xxxx" method="post" id="mc-embedded-subscribe-form" name="mc-embedded-subscribe-form" class="validate" target="_blank" novalidate="">
<div id="mc_embed_signup_scroll">
<input type="email" value="" name="EMAIL" class="email" id="mce-EMAIL" placeholder=" E-Mail Adresse" required="" />
<!-- real people should not fill this in and expect good things - do not remove this or risk form bot signups-->
<div style="position: absolute; left: -5000px;">
<input type="text" name="xxxxxxxxxxxxxxxxxxxxx_xxxxxxxxxxxx" tabindex="-1" value="" />
</div>
<div class="clear">
<input type="submit" value="senden" name="senden" id="mc-embedded-subscribe" class="button" />
</div>
</div>
</form>
</div>
<!--End mc_embed_signup-->
Thanks for the help.

Answer 1

Sorry for not mentioning the code it was my first question and didn't notice to put 4 spaces for the code.
I solved it by adding "&email=value" in the last of my url.
<!-- Begin MailChimp Signup Form -->
<div id="mc_embed_signup">
<form action="http://boooo.us7.list-manage.com/subscribe?u=2e01f07a729f6f76a41a34ca5&id=66efb8b1bb&email=value" method="post" id="mc-embedded-subscribe-form" name=
"mc-embedded-subscribe-form" class="validate" target="_blank" novalidate="">
<div id="mc_embed_signup_scroll">
<input type="email" value="" name="EMAIL" class="email" id="mce-EMAIL" placeholder=" E-Mail Adresse" required="#" />
<!-- real people should not fill this in and expect good things - do not remove this or risk form bot signups-->
<div style="position: absolute; left: -5000px;">
<input type="text" name="e01f07a729f76a41a34ca5_66efb8" tabindex="-1" value="" />
</div>
<div class="clear">
<input type="submit" value="senden" name="senden" id="mc-embedded-subscribe" class="button" />
</div>
</div>
</form>
</div>
<!--End mc_embed_signup mce-EMAIL mc4wp_email //eepurl.com/-Mi4r
-->

Answer 2

You can use the $_POST variable on your backend form for this.
The first form:
<form action="subscription.php" method="post">
<input type="text" name="first_email">
<input type="submit">
</form>
The subscription form:
<form action="mailchimp.php">
<input type="text" name="email" value="<?php echo $_POST['first_email']; ?>"
....
For more info:
http://php.net/manual/en/reserved.variables.post.php

Answer 3

If all you want to do is go to that mailchimp signup page and prefill the email, this link seems to work:
https://boooo.us7.list-manage.com/subscribe?u=2e01f07a729f6f76a41a34ca5&id=66efb8b1bb&MERGE0=foobar#foobar.com
If you need a form, try
<!-- Mailchimp Signup Form -->
<form
action="https://boooo.us7.list-manage.com/subscribe?u=2e01f07a729f6f76a41a34ca5&id=66efb8b1bb"
method="post" target="_blank">
<input type="email" name="MERGE0" placeholder="Your e-mail">
<input type="submit" value="Subscribe">
</form>
<!--End Mailchimp Signup Form -->