许多教程都过时了，甚至当前的代码都没有考虑设备注册id何时更新或设备取消注册。如果不检查这些项目，最终将导致无法接收消息的问题。http://forum.loungekatt.com/viewtopic.php?t=63#p181

使用这个

 function pnstest(){

                $data = array('post_id'=>'12345','title'=>'A Blog post', 'message' =>'test msg');

                $url = 'https://fcm.googleapis.com/fcm/send';

                $server_key = 'AIzaSyDVpDdS7EyNgMUpoZV6sI2p-cG';

                $target ='fO3JGJw4CXI:APA91bFKvHv8wzZ05w2JQSor6D8lFvEGE_jHZGDAKzFmKWc73LABnumtRosWuJx--I4SoyF1XQ4w01P77MKft33grAPhA8g-wuBPZTgmgttaC9U4S3uCHjdDn5c3YHAnBF3H';

                $fields = array();
                $fields['data'] = $data;
                if(is_array($target)){
                    $fields['registration_ids'] = $target;
                }else{
                    $fields['to'] = $target;
                }

                //header with content_type api key
                $headers = array(
                    'Content-Type:application/json',
                  'Authorization:key='.$server_key
                );

                $ch = curl_init();
                curl_setopt($ch, CURLOPT_URL, $url);
                curl_setopt($ch, CURLOPT_POST, true);
                curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
                curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
                curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
                curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
                curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($fields));
                $result = curl_exec($ch);
                if ($result === FALSE) {
                    die('FCM Send Error: ' . curl_error($ch));
                }
                curl_close($ch);
                return $result;

}

<?php

function sendMessageToPhone($deviceToken, $collapseKey, $messageText, $yourKey) {    
    echo "DeviceToken:".$deviceToken."Key:".$collapseKey."Message:".$messageText
            ."API Key:".$yourKey."Response"."<br/>";

    $headers = array('Authorization:key=' . $yourKey);    
    $data = array(    
        'registration_id' => $deviceToken,          
        'collapse_key' => $collapseKey,
        'data.message' => $messageText);  
    $ch = curl_init();    

    curl_setopt($ch, CURLOPT_URL, "https://android.googleapis.com/gcm/send");    
    if ($headers)    
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);    
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);    
    curl_setopt($ch, CURLOPT_POST, true);    
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);    
    curl_setopt($ch, CURLOPT_POSTFIELDS, $data);    

    $response = curl_exec($ch);    
    var_dump($response);
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);    
    if (curl_errno($ch)) {
        return false;
    }    
    if ($httpCode != 200) {
        return false;
    }    
    curl_close($ch);    
    return $response;    
}  

$yourKey = "YOURKEY";
$deviceToken = "REGISTERED_ID";
$collapseKey = "COLLAPSE_KEY";
$messageText = "MESSAGE";
echo sendMessageToPhone($deviceToken, $collapseKey, $messageText, $yourKey);
?>

在上面的脚本中只需更改:

“YOURKEY”到API键到API控制台的服务器键。 "REGISTERED_ID"与您设备的注册ID "COLLAPSE_KEY"和你需要的键 "MESSAGE"包含您想要发送的消息

让我知道，如果你有任何问题在这个我能够获得通知成功使用相同的脚本。

我知道这是一个晚的答案，但它可能对那些想要使用当前FCM格式(GCM已弃用)开发类似应用程序的人有用。 下面的PHP代码用于发送主题播客。所有在上述频道/topis注册的应用程序都会收到这个推送通知。

<?php

try{
$fcm_token = 'your fcm token';
$service_url = 'https://fcm.googleapis.com/fcm/send';
$channel = '/topics/'.$adminChannel;
echo $channel.'</br>';
      $curl_post_body = array('to' => $channel,
        'content_available' => true,
        'notification' => array('click_action' => 'action_open',
                            'body'=> $contentTitle,
                            'title'=>'Title '.$contentCurrentCat. ' Updates' ,
                            'message'=>'44'),
        'data'=> array('click_action' => 'action_open',
                            'body'=>'test',
                            'title'=>'test',
                            'message'=>$catTitleId));

        $headers = array(
        'Content-Type:application/json',
        'Authorization:key='.$fcm_token);

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $service_url);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($curl_post_body));

    $result = curl_exec($ch);
    if ($result === FALSE) {
        die('FCM Send Error: ' . curl_error($ch));
        echo 'failure';
    }else{

    echo 'success' .$result;
    }
    curl_close($ch);
    return $result;

}
catch(Exception $e){

    echo 'Message: ' .$e->getMessage();
}
?>

许多教程都过时了，甚至当前的代码都没有考虑设备注册id何时更新或设备取消注册。如果不检查这些项目，最终将导致无法接收消息的问题。http://forum.loungekatt.com/viewtopic.php?t=63#p181

你也可以试试下面这段代码:

<?php
    define("GOOGLE_API_KEY", "AIzaSyCJiVkatisdQ44rEM353PFGbia29mBVscA");
    define("GOOGLE_GCM_URL", "https://android.googleapis.com/gcm/send");

    function send_gcm_notify($reg_id, $message) {
        $fields = array(
            'registration_ids'  => array( $reg_id ),
            'data'              => array( "message" => $message ),
        );

        $headers = array(
            'Authorization: key=' . GOOGLE_API_KEY,
            'Content-Type: application/json'
        );

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, GOOGLE_GCM_URL);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($fields));

        $result = curl_exec($ch);
        if ($result === FALSE) {
            die('Problem occurred: ' . curl_error($ch));
        }

        curl_close($ch);
        echo $result;
    }

    $reg_id = "APA91bHuSGES.....nn5pWrrSz0dV63pg";
    $msg = "Google Cloud Messaging working well";

    send_gcm_notify($reg_id, $msg);