151 lines
4.7 KiB
PHP
151 lines
4.7 KiB
PHP
<?php
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namespace app\common\helper;
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class WxPayHelper
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{
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/**
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* 根据权重随机获取一个商户
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*
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* @param array $merchants 商户数组
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* @return array|null 随机选择的商户信息
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*/
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public static function getRandomMerchant(array $merchants)
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{
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if (empty($merchants)) {
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return null;
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}
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// 只有一个商户，直接返回
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if (count($merchants) === 1) {
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return $merchants[0];
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}
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// 计算总权重
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$totalWeight = 0;
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foreach ($merchants as $merchant) {
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$totalWeight += isset($merchant['weight']) ? (int)$merchant['weight'] : 1;
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}
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// 生成随机数
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$randomWeight = mt_rand(1, $totalWeight);
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// 根据权重选择商户
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$currentWeight = 0;
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foreach ($merchants as $merchant) {
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$weight = isset($merchant['weight']) ? (int)$merchant['weight'] : 1;
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$currentWeight += $weight;
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if ($randomWeight <= $currentWeight) {
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return $merchant;
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}
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}
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// 默认返回第一个商户
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return $merchants[0];
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}
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/**
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* 获取微信支付配置
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*
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* @return array 包含随机选择的商户信息和appid
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*/
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public static function getWxPayConfig()
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{
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$wechat_setting = getConfig('wechat_setting');
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$weixinpay_setting = getConfig('weixinpay_setting');
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// 选择一个随机商户
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$merchant = null;
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if (!empty($weixinpay_setting) && !empty($weixinpay_setting['merchants'])) {
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$merchant = self::getRandomMerchant($weixinpay_setting['merchants']);
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} else {
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// 兼容旧配置
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$old_config = getConfig('weixinpay');
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if (!empty($old_config)) {
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$merchant = [
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'name' => '默认商户',
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'mch_id' => $old_config['mch_id'],
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'keys' => $old_config['keys'],
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'order_prefix' => $old_config['order_prefix'] ?? 'MYH',
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'weight' => 1
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];
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}
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}
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// 获取微信AppID
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$appid = '';
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if (!empty($wechat_setting) && !empty($wechat_setting['appid'])) {
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$appid = $wechat_setting['appid'];
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} else if (!empty($old_config) && !empty($old_config['appid'])) {
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$appid = $old_config['appid'];
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}
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return [
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'merchant' => $merchant,
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'appid' => $appid
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];
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}
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/**
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* 获取固定的微信支付配置（基于订单前缀）
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*
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* @param string $order_prefix 订单前缀，如果提供则返回对应前缀的商户信息
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* @return array 包含固定商户信息和appid
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*/
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public static function getFixedWxPayConfig($order_prefix = '')
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{
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$wechat_setting = getConfig('wechat_setting');
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$weixinpay_setting = getConfig('weixinpay_setting');
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// 尝试查找与订单前缀匹配的商户
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$merchant = null;
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if (!empty($order_prefix) && !empty($weixinpay_setting) && !empty($weixinpay_setting['merchants'])) {
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foreach ($weixinpay_setting['merchants'] as $m) {
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if (!empty($m['order_prefix']) && $m['order_prefix'] === $order_prefix) {
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$merchant = $m;
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break;
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}
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}
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}
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// 如果没有找到匹配的商户，则使用随机选择
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if (empty($merchant)) {
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return self::getWxPayConfig();
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}
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// 获取微信AppID
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$appid = '';
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if (!empty($wechat_setting) && !empty($wechat_setting['appid'])) {
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$appid = $wechat_setting['appid'];
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} else {
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$old_config = getConfig('weixinpay');
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if (!empty($old_config) && !empty($old_config['appid'])) {
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$appid = $old_config['appid'];
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}
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}
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return [
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'merchant' => $merchant,
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'appid' => $appid
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];
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}
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/**
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* 从订单号中提取商户前缀
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*
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* @param string $order_no 订单号（格式如 MH_ABC20240529...)
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* @return string|null 商户前缀，如果无法提取则返回null
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*/
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public static function extractOrderPrefix($order_no)
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{
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if (strpos($order_no, 'MH_') === 0) {
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// 尝试提取MH_后的3个字符作为商户前缀
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$prefix = substr($order_no, 3, 3);
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if (!empty($prefix) && strlen($prefix) === 3) {
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return $prefix;
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}
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}
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return null;
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}
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}
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