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並前往https://stackoverflow.com/questions/8796707/is-it-possible-to-have-a-html-select-option-value-as-null-using-php

Is it possible to have a HTML SELECT ... - Stack Overflow

No, POST/GET values are never null . The best they can be is an empty string, which you can convert to null / 'NULL' . if ($_POST['value'] ...

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