PHPで多次元配列のソートが簡単にできる便利な機能があったので，忘れないようにメモ。
usort（）で比較関数を準備したりしなくても，簡単にできるのでした。
01 | $data = array(); |
02 | $data[] = array('num' => 24, 'name' => 'red'); |
03 | $data[] = array('num' => 3, 'name' => 'blue'); |
04 | $data[] = array('num' => 15, 'name' => 'green'); |
05 | $data[] = array('num' => 77, 'name' => 'white'); |
06 | $data[] = array('num' => 15, 'name' => 'black'); |
07 |
08 | print_r($data); |
09 |
10 | foreach($data as $key => $row) { |
11 | $num[$key] = $row['num']; |
12 | $name[$key] = $row['name']; |
13 | } |
14 | array_multisort($num, SORT_DESC, $name, SORT_ASC, $data); |
15 |
16 | print_r($data); |
実行結果はこうなります。
ソート前
01 | Array( |
02 | [0] => Array |
03 | ( |
04 | [num] => 24 |
05 | [name] => red |
06 | ) |
07 | [1] => Array |
08 | ( |
09 | [num] => 3 |
10 | [name] => blue |
11 | ) |
12 | [2] => Array |
13 | ( |
14 | [num] => 15 |
15 | [name] => green |
16 | ) |
17 | [3] => Array |
18 | ( |
19 | [num] => 77 |
20 | [name] => white |
21 | ) |
22 | [4] => Array |
23 | ( |
24 | [num] => 15 |
25 | [name] => black |
26 | ) |
27 | ) |
ソート後
01 | Array( |
02 | [0] => Array |
03 | ( |
04 | [num] => 77 |
05 | [name] => white |
06 | ) |
07 | [1] => Array |
08 | ( |
09 | [num] => 24 |
10 | [name] => red |
11 | ) |
12 | [2] => Array |
13 | ( |
14 | [num] => 15 |
15 | [name] => black |
16 | ) |
17 | [3] => Array |
18 | ( |
19 | [num] => 15 |
20 | [name] => green |
21 | ) |
22 | [4] => Array |
23 | ( |
24 | [num] => 3 |
25 | [name] => blue |
26 | ) |
な感じで，’num’ の降順，’name’ の昇順で，綺麗に揃いました。
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