<?php
 
$array = ['Лена', 'Оля', 'Дана'];
 
$str1 = $array[0] . $array [1] . ' ' . $array[0] . $array [1] . $array [2];
$str2 = $array[1] . $array [2] . ' ' . $array[1] . $array [2] . $array [0];
$str3 = $array[2] . $array [0] . ' ' . $array[2] . $array [0] . $array [1];
$str4 = $array[0] . $array [2] . ' ' . $array[0] . $array [2] . $array [1];
$str5 = $array[1] . $array [0] . ' ' . $array[1] . $array [0] . $array [2];
$str6 = $array[2] . $array [1] . ' ' . $array[2] . $array [1] . $array [0];
 
echo "{$str1}\n{$str2}\n{$str3}\n{$str4}\n{$str5}\n{$str6}";
 
 ?>
 

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