Phil Sturgeon committed f9fab42

Added form_helper form_open() behaviour change to upgrade guide.

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 <p>This config file has been updated to contain more mime types, please copy it to <kbd>application/config/mimes.php</kbd>.</p>
+<h2>Step 3: Check for forms posting to default controller</h2>
+	The default behavior for <kbd>form_open()</kbd> when called with no parameters used to be to post to the default controller, but it will now just leave an empty action="" meaning the form will submit to the current URL.
+	If submitting to the default controller was the expected behavior it will need to be changed from:
+<code>echo form_open(); //&lt;form action="" method="post" accept-charset="utf-8"></code>
+<p>to use either a / or <kbd>base_url()</kbd>:</p>
+<code>echo form_open('/'); //&lt;form action="" method="post" accept-charset="utf-8"><br/>
+echo form_open('/'); //&lt;form action="" method="post" accept-charset="utf-8"></code>
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