Php Form Builder Framework Populate Form from Session -

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i`m using pfbc framework setting forms. have small checkout form need post (step 1 ). once validated , posted form redirects next page (step 2).

i want enable customers change form input when using button (browser).

somehow dont see manage pre populate fields session. form classes defined in form:php 

$form = new form("question");  // prevent bootstrap , jquery re-loading, loaded in doc head $form->configure(array("prevent" => array("jquery"), "view" => new view_sidebyside, "labeltoplaceholder" => 0)); $form->addelement(new element_hidden("form", "question"));  $form->addelement(new element_html('<hr />')); $form->addelement(new element_select("type:", "type", $options, array("id" => "type", "class" => "form-control", "required" => 1, "data-placeholder" => "kies een type"))); $form->addelement(new element_textbox("titel:", "title", array("id" => "title", "class" => "form-control", "required" => 1, "placeholder" => "geef hier een duidelijke titel op"))); $form->addelement(new element_button("verstuur", "submit", array("id" => "submit"))); $form->addelement(new element_html('hr />'));  $form->render(); echo $id; //----------after form has been submitted---------- if ($_post["form"] == 'question') {     //additionele values      //unset values dont belong in db     unset($_post["form"]);     //enter data db     //$api->dbsave('application', $_post);      //$id  = mysql_insert_id();     //$_session['formpost'] = $id;      //clear values , redirect     form::clearvalues("question");      header("location: " . $this->root . "next-page/step-2/"); }


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