微信js接口签名生成-后端

<?php
// 签名公司效验地址 https://mp.weixin.qq.com/debug/cgi-bin/sandbox?t=jsapisign
// 方法1 get_access_token() 获取 access_token
// 方法2 get_jsapi_ticket() 获取 jsapi_ticket
// 方法3 fen_xaing_config($url) 获取js分享配置文件,需要传入分享的地址(#号以前的)
class WeiXingInit{

	public $APPID = 'XXXX';
	public $SECRET = 'XXXXXXX';


	// access_token 存储文件 频繁刷新access_token会导致api调用受限，影响自身业务，开发者必须在自己的服务全局缓存access_token
	public $fileName_access = 'access_token';
	// jsapi_ticket 存储文件 频繁刷新jsapi_ticket会导致api调用受限，影响自身业务，开发者必须在自己的服务全局缓存jsapi_ticket
	public $fileName_jsapi_ticket = 'jsapi_ticket';

	public $debug = false;

	// 获取 access_token
	public function get_access_token(){
		$data = [];

		if(is_file($this->fileName_access)){

			// 验证是否过期
			$time = time();
			$data = json_decode(file_get_contents($this->fileName_access),true);
			
			if(($time-$data['time']) > ($data['expires_in']-100)){
				$data = $this->access_token_get_save();
			}
		}else{
			$data = $this->access_token_get_save();
		}

		return $data;
    }

    // access_token 获取保存
    function access_token_get_save(){
    	$url = "https://api.weixin.qq.com/cgi-bin/token";
        $post_string = "grant_type=client_credential&appid=".$this->APPID."&secret=".$this->SECRET;

        $data = json_decode($this->curl($url, $post_string), true);
        $data['time'] = time();
        file_put_contents($this->fileName_access, json_encode($data));
        return $data;
    }


    // 获取 jsapi_ticket
	public function get_jsapi_ticket(){
		$data = [];

		if(is_file($this->fileName_jsapi_ticket)){

			// 验证是否过期
			$time = time();
			$data = json_decode(file_get_contents($this->fileName_jsapi_ticket),true);
			
			if(($time-$data['time']) > ($data['expires_in']-100)){
				$data = $this->jsapi_ticket_get_save();
			}
		}else{
			$data = $this->jsapi_ticket_get_save();
		}

		return $data;
    } 

    // jsapi_ticket 获取保存
    function jsapi_ticket_get_save(){
    	$data = [];

    	$data_access = $this->get_access_token();

    	if(!empty($data_access['access_token'])){
    		$url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket";

	        $post_string = "access_token=".$data_access['access_token']."&type=jsapi";

	        $data = json_decode($this->curl($url, $post_string), true);
	        $data['time'] = time();
	        file_put_contents($this->fileName_jsapi_ticket, json_encode($data));
    	}
        return $data;
    }

    // 生成随机字符串
    function generate_password( $length = 8 ) { 
		// 密码字符集，可任意添加你需要的字符 
		$chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; 
		$password = ""; 
		for ( $i = 0; $i < $length; $i++ ) 
		{ 
		// 这里提供两种字符获取方式 
		// 第一种是使用 substr 截取$chars中的任意一位字符； 
		// 第二种是取字符数组 $chars 的任意元素 
		// $password .= substr($chars, mt_rand(0, strlen($chars) – 1), 1); 
		$password .= $chars[ mt_rand(0, strlen($chars) - 1) ]; 
		} 
		return $password; 
	}

	// 微信分享config
	public function fen_xaing_config($url){
		$noncestr = $this->generate_password(15);
    	$time = time();
		return [
			'debug' => $this->debug,
			'appId' => $this->APPID, // 必填，公众号的唯一标识
		    'timestamp' => $time, // 必填，生成签名的时间戳
		    'nonceStr' => $noncestr, // 必填，生成签名的随机串
		    'signature' => $this->get_qian_ming($url, $time, $noncestr),// 必填，签名
		    'jsApiList' => ['onMenuShareTimeline', 'onMenuShareAppMessage', 'onMenuShareQQ', 'onMenuShareWeibo', 'onMenuShareQZone'] // 必填，需要使用的JS接口列表
		];
	}

    // 生成签名
    function get_qian_ming($url, $time, $noncestr){
    	$data_jsapi = $this->get_jsapi_ticket();
    	$str = "";
    	if(!empty($data_jsapi['ticket'])){
    		$jsapi_ticket = $data_jsapi['ticket'];
    		$timestamp = $time;
    		$str = "jsapi_ticket=$jsapi_ticket&noncestr=$noncestr×tamp=$timestamp&url=$url";
    		$str = sha1($str);
    	}
    	return $str;
    	
    }



    function curl($remote_server, $post_string) {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $remote_server);
        curl_setopt($ch, CURLOPT_POSTFIELDS,$post_string);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        // curl_setopt($ch, CURLOPT_USERAGENT, "qianyunlai.com's CURL Example beta");
        $data = curl_exec($ch);
        curl_close($ch);
        return $data;
    }

}
?>