Questions about sorting the PHP array?

$arr = Array (' Medium ', ' fall ', ' knots ', ' fast ', ' le ')

I want to achieve the above in this array of items (happy Mid-Autumn Festival) before and after the order unchanged, you can add or subtract all sorts:

Happy Mid-Autumn Festival
Fast Mid-Autumn Festival
Festival Music
Mid - autumn festival
Autumn Festival Fast
Autumn Festival
Festival Music
Mid - autumn festival
In
Autumn

Like this all the

Please give us a lot of advice thank you ~

Reply to discussion (solution)

$arr = Array (' Medium ', ' fall ', ' knots ', ' fast ', ' Le '); for ($i =0; $i <=count ($arr); $i + +) {  $a = join (", Array_slice ($arr, 0,-$i)); 
  if ($i) foreach (Array_slice ($arr,-$i) as $v)    echo $a. $v, Php_eol;  else echo $a, php_eol;}

Happy Mid-Autumn Festival
Fast Mid-Autumn Festival
Festival Music
Mid - autumn festival
Fast Mid-Autumn
Mid-Autumn Music
Mid - autumn festival
Middle section
Medium and fast
Zhong Le
In
Autumn
Section
Fast
Le

$arr = Array (' Medium ', ' fall ', ' knots ', ' fast ', ' Le '); for ($i =0; $i <=count ($arr); $i + +) {  $a = join (", Array_slice ($arr, 0,-$i)); 
  if ($i) foreach (Array_slice ($arr,-$i) as $v)    echo $a. $v, Php_eol;  else echo $a, php_eol;}

Happy Mid-Autumn Festival
Fast Mid-Autumn Festival
Festival Music
Mid - autumn festival
Fast Mid-Autumn
Mid-Autumn Music
Mid - autumn festival
Middle section
Medium and fast
Zhong Le
In
Autumn
Section
Fast
Le

Thank you very much for the help of the moderator hahaha ~

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