feat:增加k线助手

+<?php
+
+namespace Jiaoyin;
+
+class KlineAssist
+{
+    public static function getUnionTime($interval, $timeType = 'ms'): int
+    {
+        $rate = $timeType == 'ms' ? 1000 : 1;
+        if ($interval == '1m') {
+            return 60 * $rate;
+        }
+        if ($interval == '5m') {
+            return self::getUnionTime('1m', $timeType) * 5;
+        }
+        if ($interval == '15m') {
+            return self::getUnionTime('1m', $timeType) * 15;
+        }
+        if ($interval == '1h') {
+            return self::getUnionTime('1m', $timeType) * 60;
+        }
+        if ($interval == '4h') {
+            return self::getUnionTime('1h', $timeType) * 4;
+        }
+        if ($interval == '1d') {
+            return self::getUnionTime('1h', $timeType) * 24;
+        }
+        return -1;
+    }
+
+}
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