FCM php sample code

sendmessage.php

// function creation
public function sendMessage($data,$target)
	{
		//FCM api URL
		$url = 'https://fcm.googleapis.com/fcm/send';
			//api_key available in Firebase Console -> Project Settings -> CLOUD MESSAGING -> Server key
			$server_key = 'Your-Server-Key';
				
	$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;
	}
}

// function calling example

if($result == true) {

// this is my custom fuction which is getting fcms ids from db and storing into array named target you can use your logic to get fcm ids from database	
$res = $db->getFCMbyConnections('Variable', 'Table_Name');
 
$target = array();
	
if(mysql_num_rows($res) > 0 ){
		
while ($row = mysql_fetch_assoc($res)) {
			
$target[] = $row["FCM"];
		
}
	
}
    
	
$data = array('key'=>'Value','key2'=>'value2');

	$db->sendMessage($data, $target);

}