php - how to get multiple values from multiple href -

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hello using bootstrap , code dont work dont know whats different echo butmy code this

<a class="btn btn-danger" href="update_appointment.php<?php echo '?f=' . $txn_id . 'id=' . $f . 'l=' . $l .'m=' . $m .'mn=' . $mn .'ptn=' . $ptn .'sn=' . $sn .'bi=' . $bi .'ui=' . $ui .'a=' . $a .'d=' . $d .'cn=' . $cn; ?>" ><i class="icon-check"></i>&nbsp;yes</a>

if enter button echo, button doesnt show? please me


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