如何在php中查找数组中的索引位置
我有一个这样的数组如何在php中查找数组中的索引位置,php,arrays,Php,Arrays,我有一个这样的数组 Array ( [33] => [53] => [82] => [36] => [47] => [42] => [1] => [12] => [86] => [68] => [31] => 1.00 [2] => 1.00 [87] => 2.00 [50] => 3.00 [10] => 3.00 [55] => 3.00 [48] => 3.00 [7
Array
(
[33] =>
[53] =>
[82] =>
[36] =>
[47] =>
[42] =>
[1] =>
[12] =>
[86] =>
[68] =>
[31] => 1.00
[2] => 1.00
[87] => 2.00
[50] => 3.00
[10] => 3.00
[55] => 3.00
[48] => 3.00
[70] => 3.00
[90] => 3.00
[37] => 3.00
[69] => 3.00
[8] => 3.00
[49] => 3.00
[26] => 3.00
[13] => 3.00
[61] => 3.00
[59] => 3.00
[73] => 4.00
[64] => 4.00
[77] => 4.00
[78] => 4.00
[65] => 4.00
[66] => 4.00
[63] => 4.00
[76] => 4.00
[51] => 4.00
[52] => 4.00
[43] => 4.00
[58] => 4.00
[60] => 4.00
[74] => 4.00
[67] => 4.00
[35] => 4.00
[17] => 4.00
[16] => 4.00
[18] => 4.00
[20] => 4.00
[41] => 4.00
[15] => 4.00
[11] => 4.00
[4] => 4.00
[5] => 4.00
[6] => 4.00
[7] => 4.00
[83] => 4.00
[22] => 4.00
[34] => 4.00
[38] => 4.00
[40] => 4.00
[25] => 4.00
[32] => 4.00
[80] => 4.00
[81] => 4.00
[27] => 4.00
[30] => 4.00
[79] => 5.00
[89] => 5.00
[88] => 5.00
[72] => 5.00
[71] => 5.00
[44] => 5.00
[21] => 5.00
[23] => 5.00
[24] => 5.00
[19] => 5.00
[14] => 5.00
[3] => 5.00
[9] => 5.00
[28] => 5.00
[29] => 5.00
[56] => 5.00
[57] => 5.00
[54] => 5.00
[46] => 5.00
[39] => 5.00
[45] => 5.00
[62] => 5.00
)
现在我要找到的是特定索引的位置。i、 e如果搜索53
,则返回其位置,即2
。我正在考虑第二个位置的53
您可以使用
$a = array_keys($array)
要获取其值为$array=>键的数组
之后你可以使用
$a = array_flip($a);
要生成数组值,请使用数组的索引(根据需要定位!)
然后
希望能有帮助
注意:如果您经常访问$a,请使用我的方式,因为它构建了数组,之后您将有O(1)个访问时间,如果您需要它进行一次或两次访问,最好使用
array\u search
从带有O(n)的array\u键的数组中获取索引。使用array\u键获取键()然后尝试使用array_search()获取它的索引
$keys = array_keys($yourArray);
$key = array_search('53', $keys);
没有测试它,但应该可以工作。通过array_keys()函数获取所有数组键,然后提取所需的键值。
请参见它不会返回1
吗,因为数组是0
索引的?在2
和53
之间没有任何关联:?$i++
应该在之后,如果将返回+1@MihaiIorga是的,OP一开始想要2(他说这是一个打字错误)。
$keys = array_keys($yourArray);
$key = array_search('53', $keys);
function findIndex($arr, $needle) {
$i = 0;
foreach ($arr as $key => $value) {
if ($key === $needle) {
return $i;
}
$i++;
}
return false;
}