Fatal error: Uncaught Error: Call to undefined function socket_create() in /var/www/html/phpkobo/research/php-snippet/websocket_demo/server.php:57 Stack trace: #0 /var/www/html/phpkobo/research/php-snippet/websocket_demo/server.php(7): WebSocket('localhost', 12345) #1 {main} thrown in /var/www/html/phpkobo/research/php-snippet/websocket_demo/server.php on line 57