HTMLにユーチューブを埋め込む

HTMLにユーチューブを入れる、埋め込む。どうしたものか？

$videos1 = <<< EO


<div style="position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%;">
  <iframe 
  src="https://www.youtube.com/embed/q6cVdrblH-U" 
  style="position: absolute; top: 0; left: 0; width: 100%; height: 100%;" 
  frameborder="0" 
  allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" 
  allowfullscreen>
  </iframe>
</div>



  
EO;
//または




$videos1 = <<< EO


<div style="position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%;">
  <iframe 
    src="https://www.youtube.com/embed/bJjyUmPG0ig" 
    style="position: absolute; top: 0; left: 0; width: 100%; height: 100%;" 
    frameborder="0" 
    allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" 
    allowfullscreen>
  </iframe>
</div>

    
    
    
      
EO;



//src="https://www.youtube.com/embed/LU79ydYPriQ"の部分がURLです