Merge pull request #12220 from civicrm/5.2

[civicrm-core.git] / CRM / Utils / Money.php

diff --git a/CRM/Utils/Money.php b/CRM/Utils/Money.php
index 555e7db6e41906f19a1c06eda0209e6b303e5982..28ecf6aafe9f662e09461120983c72f3422f77fe 100644 (file)
--- a/CRM/Utils/Money.php
+++ b/CRM/Utils/Money.php
@@ -1,7 +1,7 @@
 <?php
 /*
  +--------------------------------------------------------------------+
- | CiviCRM version 4.7                                                |
+ | CiviCRM version 5                                                  |
  +--------------------------------------------------------------------+
  | Copyright CiviCRM LLC (c) 2004-2018                                |
  +--------------------------------------------------------------------+
@@ -141,4 +141,17 @@ class CRM_Utils_Money {
     return 2;
   }
 
+  /**
+   * Subtract currencies using integers instead of floats, to preserve precision
+   *
+   * @return float
+   *   Result of subtracting $rightOp from $leftOp to the precision of $currency
+   */
+  public static function subtractCurrencies($leftOp, $rightOp, $currency) {
+    if (is_numeric($leftOp) && is_numeric($rightOp)) {
+      $precision = pow(10, self::getCurrencyPrecision($currency));
+      return (($leftOp * $precision) - ($rightOp * $precision)) / $precision;
+    }
+  }
+
 }