PHP运用foreach神奇的转换数组(实例讲解)

要求：

将二维数组$arr转换为以‘time"和‘type"为下标、‘data‘为值的二维数组；

原数组：

$arr = array(   0 => array(    "data" => 100,    "type" => 1,    "time" => "2018-01-26",   ),   1 => array(    "data" => 200,    "type" => 2,    "time" => "2018-01-26",   ),   2 => array(    "data" => 300,    "type" => 2,    "time" => "2018-01-27",   ),   3 => array(    "data" => 400,    "type" => 3,    "time" => "2018-01-27",   ),   4 => array(    "data" => 500,    "type" => 4,    "time" => "2018-01-28",   ),  );

转换：

foreach ($arr as $key => $value) { $change[$value["time"]][$value["type"]] = $value["data"];}

结果：

array(3) { ["2018-01-26"] => array(2) { [1] => int(100) [2] => int(200) } ["2018-01-27"] => array(2) { [2] => int(300) [3] => int(400) } ["2018-01-28"] => array(1) { [4] => int(500) }}

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