merge array & rename key with php -

i have following 2 arrays of objects:
first array: $array1

        array (     [0] => array         (             [match] => 1             [when] => 2013-10-13 15:00:00             [a] => ad             [b] => nip             [winner] => c             [closed] => 1             [event] => fragbite masters             [format] => 3         )      [1] => array         (             [match] => 2             [when] => 2013-10-13 15:00:00             [a] => vg             [b] => ad             [winner] =>             [closed] => 1             [event] => starseries             [format] => 5         )      [2] => array         (             [match] => 3             [when] => 2013-10-13 21:15:00             [a] => serbia             [b] => portugal             [winner] =>             [closed] => 1             [event] => esec             [format] => 1         )  ) 

second array: $array2

    array (     [0] => array         (             [match] => 1             [a] => 58             [b] => 107         )      [1] => array         (             [match] => 2             [a] => 174             [b] => 162         )      [2] => array         (             [match] => 3             [a] => 64             [b] => 59         )  ) 

i this:

    array (     [0] => array         (             [match] => 1             [when] => 2013-10-13 15:00:00             [a] => ad             [b] => nip             [winner] => c             [closed] => 1             [event] => fragbite masters             [format] => 3             [per_a] => 58             [per_b] => 107         )      [1] => array         (             [match] => 2             [when] => 2013-10-13 15:00:00             [a] => vg             [b] => ad             [winner] =>             [closed] => 1             [event] => starseries             [format] => 5             [per_a] => 174             [per_b] => 162         )      [2] => array         (             [match] => 3             [when] => 2013-10-13 21:15:00             [a] => serbia             [b] => portugal             [winner] =>             [closed] => 1             [event] => esec             [format] => 1             [per_a] => 64             [per_b] => 59         )  ) 

where key name [a] , [b] second array have been modified [per_a] , [per_b].

things tried merge both files:
array_merge & array_merge_recursive: both me result merged values of $array2 appended end of $array1.
array_combine: wont work because $array1 , $array2 haven't equal number of elements.

this part of each file, both not equal in term of elements. if have answer me apreciated ! thx in advance !

try need modify keys in function. see demo

$match : check key exists in both arrays. $wherekey1
$wherekey2 : pick values second array , put in new key $newkey1 , $newkey2

function key_compare_func($arr1, $arr2) {     $newarray = array();     $match = "match";     $wherekey1 = "a";     $wherekey2 = "b";     $newkey1 = "per_a";     $newkey2 = "per_b";      if(is_array($arr1) && is_array($arr2)){         if($arr1[$match] == $arr2[$match] ){             $newarray = array_merge($arr1, array($newkey1 => $arr2[$wherekey1], $newkey2 => $arr2[$wherekey2]));         }     }   return $newarray; }  $modifiedarray = array_map("key_compare_func",$a1, $a2); echo '<pre>';print_r($modifiedarray);echo '</pre>'; 

output:

[0] => array         (             [match] => 1             [when] => 2013-10-13 15:00:00             [a] => ad             [b] => nip             [winner] => c             [closed] => 1             [event] => fragbite masters             [format] => 3             [per_a] => 58             [per_b] => 107         )      [1] => array         (             [match] => 2             [when] => 2013-10-13 15:00:00             [a] => vg             [b] => ad             [winner] =>             [closed] => 1             [event] => starseries             [format] => 5             [per_a] => 174             [per_b] => 162         )