PHP Cainiao, some questions about the statement format

For beginners of PHP, & lt; label & nbsp; for & nbsp ;=& nbsp; "file" & nbsp; & gt; 674548322 & lt; /label & gt; & nbsp; // seriously do not understand !!!! & Lt; input & nb PHP beginners, some questions about the statement format
674548322// Seriously do not understand !!!!
// Same as above!

For these formats, how can I know the meaning of each parameter? I learned from W3C without teaching materials. PHP W3C label sharing: 674548322??? // Seriously do not understand !!!!
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Isn't it clear at W3C? Http://www.w3school.com.cn/tags/tag_label.asp
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It is recommended that you buy an html-speaking book to familiarize yourself with the basics.
In fact, if you click http://www.w3school.com.cn/to manually implement each HTML tag, you can basically know it.
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The link mentioned by the moderator has been mentioned.

If you click text in the label element, this control is triggered. That is to say, when the user selects the tag, the browser automatically redirects the focus to the form control related to the tag.
The for attribute of a tag must be the same as the id attribute of the relevant element.