Prevent multiple inserts when submitting a form in PHP

Sometimes the user may press Enter twice, and the post is inserted twice. Is there a solution to prevent this other than check if there is a...

Sometimes the user may press Enter twice, and the post is inserted twice.

Is there a solution to prevent this other than check if there is already a post with the same title and content?

Solutions:
1- Use JavaScript to stop it from sending

2 - disable the submit button once the user has submitted the form, using
JavaScript. That is what, for example
3 - Include a unique token on each POST

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