Why can't HTML form data be transferred to PHP?

Why the HTML form data cannot be transferred to PHP

1. The action attribute of the HTML form is set incorrectly and does not correspond to the PHP file;

<form action="这里的地址必须对应要提交的PHP文件地址"></form>

2. The HTML form submission method must correspond to the PHP receiving method;

3. There is an error in the PHP method of receiving parameters.

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