[英]PHP nested array from flat MySQL query result
我需要使用highcharts.com js創建折線圖。 該插件需要具有以下結構的JSON數據:
series: [{
{
name: 'book 2',
data: [
1970, 120,
2001, 50,
2005, 180,
2014, 50
]
},
{
name: 'another book',
data: [
1970, 120,
2001, 50,
2005, 180,
2014, 50
]
}
}]
(數據只是一個例子)
我想從MySQL數據庫查詢所需的數據。 數據通過PHP中的meekrodb.com庫提取。
$results = DB::query("SELECT booktitle, EditionNr, Year FROM editions");
到目前為止的查詢輸出此平面數組:
(
[0] => Array
(
[booktitle] => booktitle_a
[EditionNr] => 11
[Year] => 2012
)
[1] => Array
(
[booktitle] => booktitle_a (the same)
[EditionNr] => 12
[Year] => 2013
)
[2] => Array
(
[booktitle] => another_booktitle
[EditionNr] => 1
[Year] => 2000
)
...
頂級索引對應於查詢結果的行。 但是,數據輸出必須是分層的。 如何將其轉換為如下所示的嵌套數組?
Array
(
[name] => book_title_a
[data] => Array
(
[0] => 2012, 11 // these are the rows Year (=2012) and EditionNr (=11th edition)
[1] => 2013, 12
)
[name] => another_book_title
[data] => Array
(
[0] => 2000, 1
[1] => 2011, 2
[2] => 2012, 3
)
)
我感謝您的幫助。
-和我
嘗試這樣的事情:
$data = array();
foreach ( $rows as $row ) {
$bookTitle = $row['booktitle'];
if ( !isset( $data[$bookTitle] ) ) {
$data[$bookTitle] = array( "name" => $bookTitle, "data" => array() );
}
$data[$bookTitle]['data'][] = array( $row['Year'], $row['EditionNr'] );
}
echo json_encode( array_values( $data ) );
$result = array();
$prevbooktitle = '';
$book_count = 0;
foreach($tmp as $val){
if($val['booktitle'] != $prevbooktitle){
$result[$book_count]['name'] = $val['booktitle'];
$book_count++;
$prevbooktitle = $val['booktitle'] ;
}
$result[$book_count]['data'][] = array($val['Year'],$val['EditionNr']);
}
$series = new stdClass();
$JSONBooksArray = array();
foreach($books AS $book){
$jsonbook = new stdClass();
$jsonbook->name = $book['booktitle'];
$bookdata = array();
$bookdata[0] = $book['Year'];
$bookdata[1] = $book['EditionNr'];
$jsonbook->data = $bookdata;
$JSONBooksArray[] = $jsonbook;
}
$series->series = $JSONBooksArray;
echo json_encode($series,JSON_PRETTY_PRINT);
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