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Why does PHP make an error when using POST to receive parameters?
1. The action
attribute in the front-end form is set incorrectly or not Corresponds to the PHP file;
<!-- 表单的action属性必须与PHP文件地址对应 --> <form action="./doAction.php"></form>
2. The form submission method method
does not correspond to the receiving method in PHP;
3 , PHP receives POST data parameter name setting error.
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