【PHP】多重クラスの配列化
PHPではライブラリの使用やXMLの読み込みを行った時など多重クラスで返ってくる事があります。
ただ、この状態で帰ってこられるととても使いづらい・・・
foreachなどで順次、内容を取得することも出来ないので困ります。
なので今回は多重クラスを簡単に配列化する方法の紹介。
// サンプル用変数の作成 $class = new StdClass(); // クラス内変数 $class->class_1 = 'class_1'; // クラス内クラス1 変数有り（多重オブジェクト） $class->class_2 = new StdClass(); $class->class_2->hoge = 'hoge'; $class->class_2->fuga = 'fuga'; $class->class_2->piyo = 'piyo'; // クラス内クラス2 変数なし（多重オブジェクト） $class->class_3 = new StdClass();
現状のままだと以下のようにオブジェクトで使用しづらい状態。
object(stdClass)#4499 (3) {
["class_1"]=>
string(7) "class_1"
["class_2"]=>
object(stdClass)#4498 (3) {
["hoge"]=>
string(4) "hoge"
["fuga"]=>
string(4) "fuga"
["piyo"]=>
string(4) "piyo"
}
["class_3"]=>
object(stdClass)#4505 (0) {
}
}
get_object_varsを使用する
PHPマニュアル：get_object_vars
var_dump(get_object_vars($class));これで配列化をしてもらえますが、クラス内部のクラスまでは配列化されなくてまだ使いづらい・・・
array(3) {
["class_1"]=>
string(7) "class_1"
["class_2"]=>
object(stdClass)#4498 (3) {
["hoge"]=>
string(4) "hoge"
["fuga"]=>
string(4) "fuga"
["piyo"]=>
string(4) "piyo"
}
["class_3"]=>
object(stdClass)#4505 (0) {
}
}
json化する
json_encodeとjson_decodeを使用してPHP変数→JSON→PHP変数にするときれいな配列になります。
PHPマニュアル：json_encode
PHPマニュアル：json_decode
var_dump(json_decode(json_encode($class), true));
array(3) {
["class_1"]=>
string(7) "class_1"
["class_2"]=>
array(3) {
["hoge"]=>
string(4) "hoge"
["fuga"]=>
string(4) "fuga"
["piyo"]=>
string(4) "piyo"
}
["class_3"]=>
array(0) {
}
}
多重クラスを配列化するとforやforeachで内部を回せるのでとてもありがたいです。
再帰的にget_object_varsを行う方法もありますが、それはfanctionを作ったりするのが手間なのでjson化する方法が一番簡単でやりやすいです。
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