Php prevents refresh delivery

Php prevents refresh and submission. how does one prevent data from being submitted to the database again when the page is refreshed ?, Judging by session, do you want to prevent repeated submission of forms? Use js ., The onclick button is used to trigger the submission form. the default submit... is removed. the simple method is to use the session to determine the submission form. you can also use the token and session to control the submission form. Php prevents refresh and submission on the form page
How to prevent data from being submitted to the database again when the page is refreshed?

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Judging by session
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Do you want to prevent repeated forms from being submitted? Use js.
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The onclick button is used to trigger the submission form, removing the default submit...
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The simple method is to determine through session, or through token.
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Use session to control.

On the form page, set a session and place it in a form field. After submit, check whether the session is the same as the form field. After use, change the session value.