<p>我有一個多維數組，想要根據特定列中的值進行分組。 </p> <p>我想要依照<code>level</code>分組，但事先不知道level的值。所以，我不能像在<code>for</code>循環中說<code>while $i < 7</code>，因為我不知道<code>7</code>是level鍵的最大值，而且即使我知道也不確定我是否需要這樣做。 </p> <pre class="brush:php;toolbar:false;">[ ['cust' => 'XT8900', 'type' => 'standard', 'level' => 1], ['cust' => 'XT8944', 'type' => 'standard', 'level' => 1], ['cust' => 'XT8922', 'type' => 'premier', 'level' => 3], ['cust' => 'XT8816', 'type' => 'permier', 'level' => 3], ['cust' => 'XT7434', 'type' => 'standard', 'level' => 7], ]</pre> <p>期望的結果：</p> <pre class="brush:php;toolbar:false;">Array ( [1] => Array ( [0] => Array ( [cust] => XT8900 [type] => standard ) [1] => Array ( [cust] => XT8944 [type] => standard ) ) [3] => Array ( [2] => Array ( [cust] => XT8922 [type] => premier ) [3] => Array ( [cust] => XT8816 [type] => permier ) ) [7] => Array ( [4] => Array ( [cust] => XT7434 [type] => standard ) ) )</pre> <p><br /></p>

foreach ($input_arr as $key => &$entry) {
    $level_arr[$entry['level']][$key] = $entry;
}

$templevel=0;   

  $newkey=0;

  $grouparr[$templevel]="";

  foreach ($items as $key => $val) {
   if ($templevel==$val['level']){
     $grouparr[$templevel][$newkey]=$val;
   } else {
     $grouparr[$val['level']][$newkey]=$val;
   }
     $newkey++;       
  }
print($grouparr);

print($grouparr[7]);

[7] => Array (
      [4] => Array (
             [cust] => XT7434
             [type] => standard
             )
      )

print($grouparr[3]);

[3] => Array (
      [2] => Array (
             [cust] => XT8922
             [type] => premier
             )

      [3] => Array (
             [cust] => XT8816
             [type] => permier
             )
      )