微信中定时任务执行时，提示access_token失效（小记）

情景再现：定时任务通了，但定时函数定时执行时，日志中打印出错误信息access_token失效（或获取不到等），测试表中的access_token为0；而自己直接访问定时函数的链接时是可以获取到access_token的。

原因：自己执行时，是在微信中打开的链接，这样执行获取access_token的函数时传递了“使用微信”的token值；而定时函数定时执行时，没有使用微信，即没有token参数传递给获取access_token的函数，这样就获取不到有效的access_token。

解决方法：定时任务使用获取access_token函数时，传递一个长期有效的token参数，如商家联系人的微信token（保证该微信一直关注微信公众号即可）。

相关函数：

// 获取access_token，自动带缓存功能function get_access_token($token = '', $update = false) {    empty ( $token ) && $token = get_token ();    $info = get_token_appinfo ( $token );    // 微信开放平台一键绑定    if ($token == 'gh_3c884a361561' || $info ['is_bind']) {        $access_token = get_authorizer_access_token ( $info ['appid'], $info ['authorizer_refresh_token'], $update );    } else {        $access_token = get_access_token_by_apppid ( $info ['appid'], $info ['secret'], $update );    }    // 自动判断access_token是否已失效，如失效自动获取新的    if ($update == false) {        $url = 'https://api.weixin.qq.com/cgi-bin/getcallbackip?access_token=' . $access_token;        $res = wp_file_get_contents ( $url );        $res = json_decode ( $res, true );        if ($res ['errcode'] == '40001') {            $access_token = get_access_token ( $token, true );        }    }    return $access_token;}// 获取当前用户的Tokenfunction get_token($token = NULL) {    $stoken = session ( 'token' );    $reset = false;    if ($token !== NULL && $token != '-1') {        session ( 'token', $token );        $reset = true;    } elseif (! empty ( $_REQUEST ['token'] ) && $_REQUEST ['token'] != '-1') {        session ( 'token', $_REQUEST ['token'] );        $reset = true;    } elseif (! empty ( $_REQUEST ['publicid'] )) {        $publicid = I ( 'publicid' );        $token = D ( 'Common/Public' )->getInfo ( $publicid, 'token' );        $token && session ( 'token', $token );        $reset = true;    }    $token = session ( 'token' );    if (! empty ( $token ) && $token != '-1' && $stoken != $token && $GLOBALS ['is_wap']) {        session ( 'mid', null );    }    //加校验，防止使用无权限的公众号    /*if(!$GLOBALS['is_wap'] && $reset){        if(empty($GLOBALS['myinfo'])) $token = -1;        else{            $sql = 'SELECT public_id FROM `'.C('DB_PREFIX').'public_link` as l LEFT JOIN '.C('DB_PREFIX').'public as p on l.mp_id=p.id WHERE l.uid='.$GLOBALS['mid'];            $list = M()->query($sql);            $flat = false;            foreach ($list as $value) {                if($value['public_id']==$token){                    $flat = true;                }            }            if(!$flat) $token = -1;        }    }*/    if (empty ( $token ) ) {        $token = -1;    }    return $token;}// 获取公众号的信息function get_token_appinfo($token = '', $field = '') {    empty ( $token ) && $token = get_token ();    if ($token != 'gh_3c884a361561') {        $info = D ( 'Common/Public' )->getInfoByToken ( $token, $field );    }    return $info;}function get_authorizer_access_token($appid, $refresh_token, $update) {    if (empty ( $appid )) {        return 0;    }    $key = 'authorizer_access_token_' . $appid;    $res = S ( $key );    if ($res !== false && ! $update)        return $res;    $dao = D ( 'Addons://PublicBind/PublicBind' );    if (empty ( $refresh_token )) {        $auth_code = $dao->_get_pre_auth_code ();        $info = $dao->getAuthInfo ( $auth_code );        $authorizer_access_token = $info ['authorization_info'] ['authorizer_access_token'];    } else {        $info = $dao->refreshToken ( $appid, $refresh_token );        $authorizer_access_token = $info ['authorizer_access_token'];    }    if (! empty ( $authorizer_access_token )) {        S ( $key, $authorizer_access_token, $info ['expires_in'] - 200 );        return $authorizer_access_token;    } else {        addWeixinLog ( $info, 'get_authorizer_access_token_fail_' . $appid );        return 0;    }}function get_access_token_by_apppid($appid, $secret, $update = false) {    if (empty ( $appid ) || empty ( $secret )) {        return 0;    }    $key = 'access_token_apppid_' . $appid . '_' . $secret;    $res = S ( $key );    if ($res !== false && ! $update)        return $res;    $url = 'https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&secret=' . $secret . '&appid=' . $appid;    $tempArr = json_decode ( get_data ( $url ), true );    if (@array_key_exists ( 'access_token', $tempArr )) {        S ( $key, $tempArr ['access_token'], $tempArr ['expires_in'] );        return $tempArr ['access_token'];    } else {        return 0;    }}// 防超时的file_get_contents改造函数function wp_file_get_contents($url) {    return get_data ( $url, 30 );}// 以GET方式获取数据，替代file_get_contentsfunction get_data($url, $timeout = 5) {    $msg = $flat = '';    if (strpos ( $url, 'http://' ) !== false || strpos ( $url, 'https://' ) !== false) {        $ch = curl_init ();        curl_setopt ( $ch, CURLOPT_URL, $url );        curl_setopt ( $ch, CURLOPT_RETURNTRANSFER, 1 );        curl_setopt ( $ch, CURLOPT_CONNECTTIMEOUT, $timeout );        curl_setopt ( $ch, CURLOPT_SSL_VERIFYPEER, FALSE ); // 跳过证书检查        curl_setopt ( $ch, CURLOPT_SSL_VERIFYHOST, FALSE ); // 不检查证书        $res = curl_exec ( $ch );        $flat = curl_errno ( $ch );        if ($flat) {            $msg = curl_error ( $ch );        }        curl_close ( $ch );    } else {        $context = stream_context_create ( array (                'http' => array (                        'timeout' => 30                 )         ) ); // 超时时间，单位为秒        $res = file_get_contents ( $url, 0, $context );    }    return $res;}