The $media->children() method in conjunction with the yt: namespace returns this node as a SimpleXML object, and the object's attributes() method retrieves the value of the seconds attribute.
$media->children()方法联合yt:名称空间以SimpleXML对象的形式返回这个节点，该对象的attributes() 方法检索seconds属性的值。
The $media->children() method in conjunction with the yt: namespace returns this node as a SimpleXML object, and the object's attributes() method retrieves the value of the seconds attribute.
$media->children()方法联合yt:名称空间以SimpleXML对象的形式返回这个节点，该对象的attributes() 方法检索seconds属性的值。
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