Need more information on gform_post_submission and $form

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Here is an example of the gform_post_submission hook to change the post content, adding values from submitted fields, including an image field. This is an example of using the form object with the gform_post_submission hook.

<?php
add_action("gform_post_submission", "set_post_content", 10, 2);
function set_post_content($entry, $form){

//getting post
$post = get_post($entry["post_id"]);

//changing post content
$post->post_content = "Blender Version:" . $entry[7] . "<br/> <img src='" . $entry[8] . "'> <br/> <br/> " . $entry[13] . " <br/> <img src='" . $entry[5] . "'>";

//updating post
wp_update_post($post);
}
?>

Here is documentation on the form object:

http://s3.amazonaws.com/gravityforms/documentation/gform_form_object.pdf

Here is documentation on the gform_post_submission hook:

http://s3.amazonaws.com/gravityforms/documentation/gform_post_submission.pdf