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How to solve the problem with the form?
all information should be sent to the mail,
but the problem is that when you select one value, everything comes.
But if done as an array comes an empty array
<select multiple name="bereich[]" size="13">
<option value="Behälterproduktion">Behälterproduktion</option>
<option value="Behälterreparatur">Behälterreparatur</option>
<option value="Fahrzeugteile">Fahrzeugteile</option>
<option value="Werbemittel">Werbemittel</option>
<option value="Dekorationsbau">Dekorationsbau</option>
<option value="Dachsanierung">Dachsanierung</option>
<option value="Terrassensanierung">Terrassensanierung</option>
<option value="Teichbau">Teichbau</option>
<option value="Schwimmbadbau">Schwimmbadbau</option>
<option value="Kläranlagenbau">Kläranlagenbau</option>
<option value="Kläranlagensanierung">Kläranlagensanierung</option>
<option value="Feuerwehrtechnik">Feuerwehrtechnik</option>
<option value="Vordächer">Vordächer</option>
</select>
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array is obtained, because where you cast goes to a string
Try to use on the handler side implode(',', $bereich_arr)
Get a string in which values are separated by commas
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