GOAL
To set ShortCode attributes dynamically, specifically the PRICE ("ra" or Regular Amount) and DESCRIPTION, using HOOKS, instead of a php-exec plugin.
BACKGROUND
I read the Forum post from Jason "TIP: Using variables in a Shortcode" (viewtopic.php?f=36&t=1604), but I wanted to use HOOKS (Filters or Actions), instead of a PHP-exec plugin. I also watched the new Video series, related to the post "Custom Registration Fields ( a developer how-to )" (viewtopic.php?f=36&t=2834).
I found the ShortCode prep code in "s2member-pro/includes/classes/gateways/paypal/paypal-form-in.inc.php", and I found this hook:
ws_plugin__s2member_pro_before_sc_paypal_form_after_shortcode_atts
I created my /wp-content/mu-plugins/s2-hacks.php file, and wrote this:
- Code: Select all
/*
DYNAMIC SHORTCODES USING HOOKS IN S2MEMBER PRO.
Get the Quantity var from the url, multiply it by the Price (per user), to derive a Total, and update the RA (Regular Amount) attribute of the ShortCode. Also update the Description accordinly, using our own custom Replacement Codes! Using Hooks instead of php-exec plugins.
*/
add_action('ws_plugin__s2member_pro_before_sc_paypal_form_after_shortcode_atts','my_dynamic_price',10);
function my_dynamic_price ( $vars = array() ) {
# PREP
$attr = &$vars["__refs"]["attr"]; // get the vars as REFERENCES so we actually modify the originals, not just copy them.
# QUANTITY
$quantity = htmlentities($_GET['qty']); // from link on Membership Options page.
if(!is_int($quantity)) { // verify it's an integer, otherwise default to 1.
$quantity = 1;
}
# PRICE
$price_each = $attr["ra"]; // price for Individual; from orig RA (price) in ShortCode.
$total = $quantity * $price_each; // math.
//$total = 9876; //TEST with hardcode value.
# DESCRIPTION
$orig_desc = $attr["desc"]; // orig DESCRIPTION expects two Custom Replacement Codes: %%My-Qty%% and %%My-Price%%.
$new_desc = str_ireplace('%%My-Qty%%', $quantity, $orig_desc); // replace
$new_desc = str_ireplace('%%My-Price%%', $total, $new_desc); // replace
# OUTPUT
$attr["ra"] = "$total"; // update RA to new value. $total must be in quotes, to make $attr["ra"] be a string, which I guess it needs to be.
$attr["desc"] = $new_desc; // update DESCRIPTION so user sees new values.
}
So if my form url is "domain.com/signup?qty=20" and if my shortcode has these attributes: ra="99" and desc="Group account for %%My-Qty%% users: $%%My-Price%% USD / Monthly ( recurring charge, for ongoing access )"
then my form shows "Group account for 20 users: $1980 USD / Monthly ( recurring charge, for ongoing access )"
And after payment, my PayPal dev sandbox > Test Emails shows:
For:Group account for 20 users: $1980 USD / Monthly ( recurring charge, for ongoing access )
Amount paid each time:$1,980.00 USD
Which looks good, I think.
