PHP-在特定键之前获取先前数组元素的快速方法

Question

如何获取特定数组键之前的所有先前元素。

这是我的数组:

$key = 256;

$array = (
125 => array(571, 570), 
284 => array(567, 566),
256 => array(562, 560),
110 => array(565, 563),
);

现在我想要这样的结果:

$array = (
125 => array(571, 570), 
284 => array(567, 566)
);

Answer 1

您可以迭代并将值推送到 newArray 直到您按下要搜索的键:

$Key = 256;

$array = array(
"125" => array(571, 570), 
"284" => array(567, 566),
"256" => array(562, 560),
"110" => array(565, 563),
);

$newArray = [];

foreach($array as $key => $value) 
{   
  if($key == $Key) break;
  $newArray[$key] = $value;
}

print_r ($newArray); 
/*
=> Array ( 
    [125] => Array ( [0] => 571 [1] => 570 ) 
    [284] => Array ( [0] => 567 [1] => 566 ) 
   )
*/