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There is a need to combine multiple data into one.
$data = Array ();
$data [] = array ("id" = "123", "name" = "Money", "before_save" = "ten", "After_save" and "" "," create_date "= > "2014-10-23");
$data [] = array ("id" = "123", "name" = "Money", "before_save" = "+", "After_save" and "+", "create_date" = > "2014-10-24");
$data [] = array ("id" = "123", "name" = "Money", "before_save" = "+", "After_save" and "" "," create_date "= > "2014-10-25");

$data [] = array ("id" = "123", "name" = "duration", "Before_save" and "Ten", "After_save" and "+", "create_date "=" 2014-10-23 ");
$data [] = array ("id" = "123", "name" = "duration", "before_save" = "+", "After_save" and "a", "create_date "=" 2014-10-24 ");


$data [] = array ("id" = "456", "name" and "Money", "before_save" = "$", "After_save" and "Max", "create_date" = > "2014-10-26");
$data [] = array ("id" = "456", "name" = "Money", "before_save" = "" "," After_save "and" "", "create_date" = > "2014-10-27");
$data [] = array ("id" = "456", "name" = "Money", "before_save" = "" "," After_save "and" + "," create_date " = "2014-10-28");

$data [] = array ("id" = "456", "name" = "duration", "Before_save" and "a", "After_save" and "a", "create_date "=" 2014-10-26 ");
$data [] = array ("id" = "456", "name" = "duration", "Before_save" and "Create_date", "after_save" = "" "=" 2014-10-27 ");
$data [] = array ("id" = "456", "name" = "duration", "before_save" = "a", "After_save" and "" "," Create_dat E "=" 2014-10-28 ");

Merge the above ID and name into one piece of data.
The consolidation rules are:
The value of Before_save is the Before_save value of the smallest create_date.
The value of After_save is the After_save value of the create_date maximum.
Maximum value of create_date

For example, the first three data results need to be
$data [] = array ("id" = "123", "name" = "Money", "before_save" = "ten", "After_save" and "" "," create_date "= > "2014-10-25");


The above results will result in a total of 4 data, respectively
$returndata [0] = array ("id" = "123", "name" = "Money", "before_save" = "ten", "After_save" and "" "," Create_ Date "=" 2014-10-25 ");
$returndata [1] = array ("id" = "123", "name" = "duration", "before_save" = "ten", "After_save" and "" "," Crea Te_date "=" 2014-10-24 ");
$returndata [2] = array ("id" = "456", "name" and "Money", "before_save" = "$", "After_save" and "+", "create _date "=" 2014-10-28 ");
$returndata [3] = array ("id" = "456", "name" = "duration", "Before_save" and "a", "After_save" and "+", "cre Ate_date "=" 2014-10-28 ");


Little brother just learn php not long, not too familiar, ask the great God help
------to solve the idea----------------------
This post was last edited by xuzuning on 2014-11-02 18:55:54

$res = Array ();
foreach ($data as  $t) $res [$t [' id ']][$t [' name ']][$t [' create_date ']] = $t;

$returndata = Array ();
foreach ($res as $t) {
  foreach ($t as $r) {
    Ksort ($R);
    $v = Array_pop ($r);
    $p = Array_shift ($r);
    $v [' before_save '] = $p [' Before_save '];
    $returndata [] = $v;
  }
}
Print_r ($returndata);

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