Pass variables from one page to a webform in drupal - php

Question

I'm trying to pass one variable from different product pages to a webform page. Each product page has a session variable like $_SESSION["product_name"] = "Product1";. Similarly, other product pages have $_SESSION["product_name"] = "Product2"; $_SESSION["product_name"] = "Product3";
My question is how to pass these variables to a different webform page. I'm using "webform" module, what I want to accomplish is there should be a <select> tag, and there are options like
<select>
<option value="<?php echo $_SESSION["product_name"]; ?>" selected><? php echo $_SESSION["product_name"]; ?></option>
<option value="Product2">Product2</option>
<option value="Product3">Product3</option>
<option value="Product4">Product4</option>
</select>
The problem is there is no place for me to place these codes, is there any way around this or is there any module I can use for this issue?

Answer 1

You can create a custom module and then implement hook_form__alter()
You would need to find the IDs of the webforms you want to target.
Then:
function mymodule_form_webform1_alter(&$form, &$form_state) {
array_unshift($form['products']['#options'], array($_SESSION["product_name"] => $_SESSION["product_name"]));
}
or similar

Answer 2

This might be a way to pass the session value to webform option default value. I'm using Drupal 7, Webform 4. The session values on different product pages are:
$_SESSION["j_product_name"] = "haha1";
$_SESSION["j_product_name"] = "haha2";
First I created a custom module, the .module part is(also need to create .info):
<?php
function jay_tokens_token_info() {
$types['jay_token'] = array(
'name' => t("Jay Tokens"),
'description' => t("Jay custom tokens"),
);
$jay_token['product_session'] = array(
'name' => t("Product Name"),
'description' => t("product_name session value"),
);
return array(
'types' => $types,
'tokens' => array(
'jay_token' => $jay_token,
),
);
}
/**
* Implements hook_tokens().
*/
function jay_tokens_tokens($type, $tokens, array $data = array(), array $options = array()) {
$replacements = array();
if ($type == 'jay_token') {
foreach ($tokens as $name => $original) {
switch ($name) {
case 'product_session':
$replacements[$original] = $_SESSION["j_product_name"];
break;
}
}
}
return $replacements;
}
?>
In webform select options, the default value should be [jay_token:product_session] and options should be:
haha1|Product1
haha2|Product2