function - Serial comma from array in PHP -

i trying make string serial comma array. here code use:

<?php     echo "i eat " . implode(', ',array('satay','orange','rambutan')); ?> 

but results get:

i eat satay, orange, rambutan 

cannot:

i eat satay, orange, , rambutan 

yet!

so, made own function:

<?php    function array_to_serial_comma($ari,$konj=" , ",$delimiter=",",$space=" "){     // if not array, quit      if(!is_array($ari)){         return false;      };     $rturn=array();     // if more 2      // actions     if(count($ari)>2){         // reverse array         $ariblk=array_reverse($ari,false);         foreach($ariblk $no=>$c){             if($no>=(count($ariblk)-1)){                  $rturn[]=$c.$delimiter;             }else{                 $rturn[]=($no==0)?                      $konj.$c                     : $space.$c.$delimiter;              };         };         // reverse array         // original         $rturn=array_reverse($rturn,false);         $rturn=implode($rturn);     }else{         // if >=2 regular merger          $rturn=implode($konj,$ari);      };      // return      return $rturn;   };  ?> 

thus:

<?php     $eat = array_to_serial_comma(array('satay','orange','rambutan'));     echo "i eat $eat"; ?> 

result:

i eat satay, orange, , rambutan 

is there more efficient way, using native php function maybe?

edit:

based on code @mash, modifying code might useful:

<?php function array_to_serial_comma($ari,$konj=" , ",$delimiter=",",$space=" "){     // if not array, quit      if(!is_array($ari)){         return false;      };     $rturn=array();     // if more 2      // actions     if(count($ari)>2){         $akr = array_pop($ari);         $rturn = implode($delimiter.$space, $ari) . $delimiter.$konj.$akr;     }else{         // if >=2 regular merger          $rturn=implode($konj,$ari);      };      // return      return $rturn;   };  ?> 

here's cleaner way:

<?php     $array = array('satay','orange','rambutan');     $last = array_pop($array);     echo "i eat " . implode(', ', $array) . ", , " . $last; ?> 

array_pop() takes last element out of array , assign $last