问PHP分组数组

EN

$grouped = array();
foreach($comments as $c) {
  if(!isset($grouped[$c['name']]) {
    $grouped[$c['name']] = array();
  }

  $grouped[$c['name']][] = $c;
}

//Now it's just a matter of a double foreach to print them out:
foreach($grouped as $name => $group) {
  //print header here
  echo $name, "<br>\n";

  foreach($group as $c) {
    //print each comment here
  }
}

$groups[] = array();
foreach( $comment as $k=>$v ) {
    $groups[$v['member_id']][] = $k
}

foreach( $group as $m_id=>$arr ) {
    echo "Group $m_id<br/>\n";
    foreach( $arr as $k ) {
        echo $comment[$k]."<br/>\n";
    }
}

 $comment_groups[] = array();
    $m_id = '';

    foreach( $comment_groups as $key=>$val ) {
         if($key == 'member_id'){
             $m_id = $val;
            }
           $comment_groups[$m_id]][] = $val;
   }