php demo.php

(php:47839): GLib-GObject-CRITICAL **: 21:58:52.645: g_value_set_boxed: assertion 'G_VALUE_HOLDS_BOXED (value)' failed
Overriding existing handler for signal 10. Set JSC_SIGNAL_FOR_GC if you want WebKit to use a different signal
Unable to init server: Could not connect: Connection refused

(WebKitWebProcess:47855): Gtk-WARNING **: 21:58:52.798: cannot open display: 

有窗口无界面信息