我有一個二維數(shù)組$artists = [ ["name" => "Post Malone", "song" => "Circles", "genre" => "Pop"], ["name" => "Camila Cabello", "song" => "Liar", "genre" => "Pop"], ["name" => "Tones and I", "song" => "Dance Monkey", "genre" => "Alternative"], ["name" => "Billie Eilish", "song" => "Bad Guy", "genre" => "Alternative"],];我正在嘗試編寫一個按流派組織數(shù)組并按流派對不同藝術(shù)家進行分組的函數(shù)。我的輸出應(yīng)該是這樣的：array ( 'Pop' => array ( 0 => 'Post Malone', 1 => 'Camila Cabello', ), 'Alternative' => array ( 0 => 'Tones and I', 1 => 'Billie Eilish', ),)我試圖先構(gòu)建外部數(shù)組function organizer($artists) { $genre = array(); for ($i = 0; $i < count($artists); $i++) { $outterArr = array_push ($artists[$i]["genre"],$genre); return $outterArr; }}但堅持如何在外部數(shù)組內(nèi)構(gòu)造一個新數(shù)組。我對編程和 php 很陌生。請展示我的技能，謝謝！
2 回答
元芳怎么了
TA貢獻1798條經(jīng)驗 獲得超7個贊
您可以使用array_reduce按流派對條目進行分組：
$artistsByGenre = array_reduce($artists, static function ($byGenre, $artist) {
$byGenre[$artist['genre']][] = $artist['name'];
return $byGenre;
}, []);
演示：https ://3v4l.org/3fU83
白板的微信
TA貢獻1883條經(jīng)驗 獲得超3個贊
function group_by($key, $data) {
$result = array();
foreach($array as $val) {
if(array_key_exists($key, $val)){
$result[$val[$key]][] = $val;
}else{
$result[""][] = $val;
}
}
return $result; }
$genres = group_by("genre", $artists);
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