HTML5 な文書を DOMDocument::loadHTML 使って読み込ませると Warning が出る。 <?php $html = '<!doctype html><html><body><video loop><source src="test.mp4"></source></video></body></html>'; $dom = new \DOMDocument(); $dom->loadHTML( $html ); var_dump( $dom->getElementsByTagName( "video" )->length ); //Warning: DOMDocument::loadHTML(): Tag video invalid in Entity, line: 1 in /path/to/sample.php on line 4 //Warning: DOMD
![Warning: DOMDocument::loadHTML() を抑制する - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/35136c55a76dd8d57169f4b58c4ddddb237ad155/height=288;version=1;width=512/https%3A%2F%2Fqiita-user-contents.imgix.net%2Fhttps%253A%252F%252Fcdn.qiita.com%252Fassets%252Fpublic%252Farticle-ogp-background-412672c5f0600ab9a64263b751f1bc81.png%3Fixlib%3Drb-4.0.0%26w%3D1200%26mark64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTk3MiZoPTM3OCZ0eHQ9V2FybmluZyUzQSUyMERPTURvY3VtZW50JTNBJTNBbG9hZEhUTUwlMjglMjklMjAlRTMlODIlOTIlRTYlOEElOTElRTUlODglQjYlRTMlODElOTklRTMlODIlOEImdHh0LWFsaWduPWxlZnQlMkN0b3AmdHh0LWNvbG9yPSUyMzIxMjEyMSZ0eHQtZm9udD1IaXJhZ2lubyUyMFNhbnMlMjBXNiZ0eHQtc2l6ZT01NiZzPTg4YTVhMDMzMzk5OGU4NzBkNDJmNDU0OTA5MTA5OWI5%26mark-x%3D142%26mark-y%3D57%26blend64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZoPTc2Jnc9NzcwJnR4dD0lNDBtZ25nJnR4dC1jb2xvcj0lMjMyMTIxMjEmdHh0LWZvbnQ9SGlyYWdpbm8lMjBTYW5zJTIwVzYmdHh0LXNpemU9MzYmdHh0LWFsaWduPWxlZnQlMkN0b3Amcz0yOTViZWVkMGI2YmUzYzEyMWMwM2MzYTNhNDEyODI5Nw%26blend-x%3D142%26blend-y%3D486%26blend-mode%3Dnormal%26s%3D85e33035689c65a5cc9bd218ae8ff7dd)