php - Facebook Messenger bot text formatting -

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i have following message fb messenger bot replies users:

$message_to_reply = "to travel info, reply in format\norigin*destination*travedate\nexample: city 1*city 2*$selected_date";

i trying add line breaks using \n looks not working. have tried chr(10), '\n', '<br>'and <center></center> , none of them working me. faced same issue , work around?


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