可以看到2d数组如下:
Array ( [0] => Array ( [0] => Prishtina [1] => Bregu i Diellit [2] => 7 )
[1] => Array ( [0] => Prishtina [1] => Tasligje [2] => 4 )
[2] => Array ( [0] => Prishtina [1] => Bregu i Diellit [2] => 4 )
[3] => Array ( [0] => Prishtina [1] => Bregu i Diellit [2] => 3 )
[4] => Array ( [0] => Prishtina [1] => Bregu i Diellit [2] => 9 )
[5] => Array ( [0] => Prishtina [1] => Lakrishte [2] => 4 )
[6] => Array ( [0] => Prishtina [1] => Lakrishte [2] => 6 )
[7] => Array ( [0] => Prishtina [1] => Lakrishte [2] => 1 )
[8] => Array ( [0] => Prishtina [1] => Ulpiana [2] => 3 )
[9] => Array ( [0] => Prishtina [1] => Ulpiana [2] => 6 )
[10] => Array ( [0] => Prishtina [1] => Ulpiana [2] => 5 )
[11] => Array ( [0] => Prishtina [1] => Ulpiana [2] => 8 )
[12] => Array ( [0] => Prishtina [1] => Ulpiana [2] => 4 )
[13] => Array ( [0] => Prishtina [1] => Ulpiana [2] => 8 )
[14] => Array ( [0] => Prishtina [1] => Velania [2] => 2 )
[15] => Array ( [0] => Prishtina [1] => Velania [2] => 5 )
[16] => Array ( [0] => Prishtina [1] => Velania [2] => 1 )
[17] => Array ( [0] => Prishtina [1] => Dragodan [2] => 9 )
[18] => Array ( [0] => Prishtina [1] => Dragodan [2] => 7 )
[19] => Array ( [0] => Prishtina [1] => Dragodan [2] => 10 )
[20] => Array ( [0] => Prishtina [1] => Velania [2] => 11 )
[21] => Array ( [0] => Mitrovica [1] => Qender [2] => 5 )
[22] => Array ( [0] => Mitrovica [1] => Qender [2] => 3 )
[23] => Array ( [0] => Mitrovica [1] => Tavnik [2] => 6 )
[24] => Array ( [0] => Mitrovica [1] => Tavnik [2] => 9 )
[25] => Array ( [0] => Mitrovica [1] => Bair [2] => 10 )
[26] => Array ( [0] => Mitrovica [1] => Bair [2] => 12 )
[27] => Array ( [0] => ) )
我正在尝试用以下代码按第三列排序:
foreach ($final_array as $roww){
$sort_column[]= $roww[2]; // 2 = your example
array_multisort($sort_column, $final_array);
}
但是当我打印时:
for ($row = 0; $row < count($final_array); $row++)
{
foreach($final_array[$row] as $key => $value)
{
echo $value;
}
echo "<br/>";
}
当我打印时,它排序并打印数组按第三列排序,但是它给我带来了这些警告
Warning: array_multisort() [function.array-multisort]: Array sizes are inconsistent in C:'xampp'htdocs'test'test.php on line 35
Notice: Undefined offset: 2 in C:'xampp'htdocs'test'test.php on line 34
我不知道为什么会发生这种情况,这对我来说没有意义,一切都在工作,但我需要这些警告!
这是一个警告,因为在索引27
处有对数组的未定义引用。这个警告是说你正在尝试使用该值,但它不存在。
再看一下你的数组
array_multisort()如果用于一次对多个数组进行排序,如果选择的所有数组在大小上不同,则返回警告:
$arr = array(
'UK' => array(
'John' => 'Toyota',
'Alice' => 'Opel',
'Evan' => 'Fiat',
'Gregory' => 'Mitsubishi'
),
'Germany' => array(
'Bruno' => 'Opel',
'Andreas' => 'Mercedes',
'Klaus' => 'Porsche',
)
);
看到了?两个数组中的元素数量不同。因此,array_multisort将尝试以相同的方式对这些数组进行排序,即使选项不同:
array_multisort(
$arr['Germany'], SORT_ASC, SORT_NATURAL,
$arr['UK'], SORT_DESC, SORT_NUMERIC
);
将打印如下警告:警告:array_multisort():数组大小不一致在(…)
另一种抛出"数组大小不一致"的情况发生在两个不相关的多维数组中使用相同的键名或键名时。如果在设置第二个多维数组中的列之前清除键名,则仍然可以使用相同的键名。如果不鼓励这样做,我很想知道原因。