prompt: string, specifies the prompt text shown as the first list option. Its value is empty. Note, the prompt text will NOT be HTML-encoded. empty: string, specifies the text corresponding to empty selection. Its value is empty. The 'empty' option can also be an array of value-label pairs. Each pair will be used to render a list option at the beginning
il risultato è il medesimo, o sbaglio? c'è una riga con scritto qualcosa e valore vuoto .. o no?

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