Making an input field required from WP’s perspective

I believe yo are looking for wp_die which will Kill WordPress execution and display HTML message with error message.

But the codex says:

It is not recommended to call this function very often and try to handle as many errors as possible silently.

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)