Tying form in with PHP

src/.env.example

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+EVENT_TICKET_PRICE="55"
+ENHANCER_TICKET_PRICE="20"
+DB_HOST="localhost"
+DB_USER="root"
+DB_PASS="root"
+POSTMARK_API_KEY="special"

src/functions.php

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+<?php
+
+/**
+ * Returns integer and santitizes bad user data
+ *
+ * @param $variable
+ * @param bool $postiveOnly
+ * @return int
+ */
+function getInteger($variable, $postiveOnly = true)
+{
+    // Change to integer if not one
+    if (!is_int($variable)) {
+        $variable = (int)$variable;
+    }
+
+    if ($postiveOnly && $variable < 0) {
+        $variable = 0;
+    }
+
+    return $variable;
+}
+
+/**
+ * Converts possible float or string to cents
+ *
+ * @param $variable
+ * @return int
+ */
+function convertPossibleFloatToCents($variable)
+{
+    $variable = intval(strval(floatval(preg_replace("/[^0-9.]/", "", str_replace(',', '.', $variable))) * 100));
+
+    return $variable;
+}
+
+
+/**
+ * Show shopping cart line item on form
+ *
+ * @param $name
+ * @param $price
+ */
+function shoppingCartLineItem($name, $price, $description = '')
+{
+    if ($price > 0) {
+        echo '<li class="list-group-item d-flex justify-content-between lh-condensed">
+                <div>
+                    <h6 class="my-0">' . $name . '</h6>
+                    <small class="text-muted">' . $description . '</small>
+                </div>
+                <span class="text-muted">' . '$' . number_format(($price/100), 2) . '</span>
+            </li>';
+    }
+
+}
+
+function shoppingCartTotal($price)
+{
+    echo '<li class="list-group-item d-flex justify-content-between">
+                <span>Total</span>
+                <strong>' . '$' . number_format(($price/100), 2) . '</strong>
+            </li>';
+}