erp/core/CoreApp/models/Model_wechat.php

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); 
class Model_wechat extends Lin_Model 
{
	function __construct(){
		parent::__construct();
		$this->load->database();
	}

	public function getopenid($code){
        $query1 = $this->db->get_where('setting',array('skey' => 'lywx_id'));
        $app_id = $query1->row_array();
		$query2 = $this->db->get_where('setting',array('skey' => 'lywx_secret'));
        $app_secret = $query2->row_array();
       
        $url = 'https://api.weixin.qq.com/sns/jscode2session';
        $params = [
            'appid' => $app_id['svalue'],
            'secret' => $app_secret['svalue'],
            'js_code' => $code,
            'grant_type' => 'authorization_code'
        ];
        $query = http_build_query($params);
        $requestUrl = $url . '?' . $query;
    
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $requestUrl);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_TIMEOUT, 10);
       
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    
        $response = curl_exec($ch);
        $errorNo = curl_errno($ch);
        $errorMsg = curl_error($ch);
        curl_close($ch);
      
        if ($errorNo !== 0) {
			$str = "cURL Error ($errorNo): $errorMsg";
            return  [
				"code"=>-1,
				"msg"=>$str
			];
        }
    
        $result = json_decode($response, true);
    
        // 检查微信返回的错误码
        if (isset($result['errcode'])) {
            $str ="WeChat API Error: " . $result['errmsg'] . " (Code: " . $result['errcode'] . ")";
            return  [
				"code"=>-1,
				"msg"=>$str
			];
        }
    
        return [
			"code"=>1,
			"msg"=>"success",
			"data"=>$result
		];
    }
	
}