复杂数组合并。。。根据键

[Hauk]

			$sheetArr = array ();
			for($i = 0; $i < count ( $userList ); $i ++) {
			    //获取用户各科目成绩
				$userGrades = $this->getUserGrades ( $userList [$i] ['userId'] );
				$sheetData ['data'] = $data;
				$sheetData ['class_name'] = $userList [$i] ['class_name'];
				$sheetData ['class_id'] = $userList [$i] ['class_id'];
				$sheetArr [] = $sheetData;
			}

我需要把sheetArr根据class_id合并起来，
如果class_id一样，就把data合并起来。

[DY_csdn]

//最后加上这么一句
$sheet[$sheetData['class_id']][] = sheetData

[xuzuning]

$sheetArr [ $userList [$i] ['class_id'] ] = ....

[傲雪星枫]

$sheetData ['data'] = $data; 这个$data是那里来的？ 估计是 $sheetData ['data'] = $userGrades; 相同class_id合拼到一个数组可以这样写

$sheetArr = array ();
for($i = 0; $i < count ( $userList ); $i ++) {
    //获取用户各科目成绩
    $userGrades = $this->getUserGrades ( $userList [$i] ['userId'] );
    $sheetData ['data'] = $userGrades;
    $sheetData ['class_name'] = $userList [$i] ['class_name'];
    $sheetData ['class_id'] = $userList [$i] ['class_id'];
    if(!isset($sheetArr[$sheetData ['class_id']])){
		$sheetArr[$sheetData ['class_id']] = array();
    }
    $sheetArr[$sheetData ['class_id']][] = $sheetData;
}