PHP determines whether the submitted value of the post is empty

1. The main method used by PHP to determine whether the post content is empty

2. Create a POST form

3. Use empty() to determine whether it is empty. !empty() will invert the result.

4. !empty () If the submitted content is not empty, output the above content

5. Save the file and view the execution results

6. Precautions for using empty()

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