<?php
$address = array(
  'street' => 'ул. Ленина',
  'house' => '15', //дом №
  'building' => '3', //корпус
  'entry' => '', //подъезд
  'floor' => '4',
  'office' => '',
  'note' => 'код домофона: 315', //примечание
);
 
$prefixes = array(
  'street' => '',
  'house' => 'д. ', 
  'building' => 'корп. ',
  'entry' => 'под. ',
  'floor' => 'эт. ',
  'office' => 'оф. ',
  'note' => '',
);
 
foreach(array_keys($address) as $key)
{
	if ($address[$key])
	{
		$result .= $prefixes[$key] . $address[$key] . " ";
	}
}
 
echo $result;
 

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