我有一个数组，我想在其中搜索uid并获得数组的键。
例子
假设我们有以下二维数组:
$userdb = array(
array(
'uid' => '100',
'name' => 'Sandra Shush',
'pic_square' => 'urlof100'
),
array(
'uid' => '5465',
'name' => 'Stefanie Mcmohn',
'pic_square' => 'urlof100'
),
array(
'uid' => '40489',
'name' => 'Michael',
'pic_square' => 'urlof40489'
)
);
函数调用search_by_uid(100)(第一个用户的uid)应该返回0。
函数调用search_by_uid(40489)应该返回2。
我试着做循环，但我想要一个更快的执行代码。
当前回答
如果问题，即。
$a = [
[
"_id" => "5a96933414d48831a41901f2",
"discount_amount" => 3.29,
"discount_id" => "5a92656a14d488570c2c44a2",
],
[
"_id" => "5a9790fd14d48879cf16a9e8",
"discount_amount" => 4.53,
"discount_id" => "5a9265b914d488548513b122",
],
[
"_id" => "5a98083614d488191304b6c3",
"discount_amount" => 15.24,
"discount_id" => "5a92806a14d48858ff5c2ec3",
],
[
"_id" => "5a982a4914d48824721eafe3",
"discount_amount" => 45.74,
"discount_id" => "5a928ce414d488609e73b443",
],
[
"_id" => "5a982a4914d48824721eafe55",
"discount_amount" => 10.26,
"discount_id" => "5a928ce414d488609e73b443",
],
];
岁:
function searchForId($id, $array) {
$did=0;
$dia=0;
foreach ($array as $key => $val) {
if ($val['discount_id'] === $id) {
$dia +=$val['discount_amount'];
$did++;
}
}
if($dia != '') {
echo $dia;
var_dump($did);
}
return null;
};
print_r(searchForId('5a928ce414d488609e73b443',$a));
其他回答
我修改了下面的一个例子，描述函数array_search。函数searchItemsByKey返回多维数组(N层)中通过$key返回的所有值。也许，它会对某人有用。例子:
$arr = array(
'XXX'=>array(
'YYY'=> array(
'AAA'=> array(
'keyN' =>'value1'
)
),
'ZZZ'=> array(
'BBB'=> array(
'keyN' => 'value2'
)
)
//.....
)
);
$result = searchItemsByKey($arr,'keyN');
print '<pre>';
print_r($result);
print '<pre>';
// OUTPUT
Array
(
[0] => value1
[1] => value2
)
函数代码:
function searchItemsByKey($array, $key)
{
$results = array();
if (is_array($array))
{
if (isset($array[$key]) && key($array)==$key)
$results[] = $array[$key];
foreach ($array as $sub_array)
$results = array_merge($results, searchItemsByKey($sub_array, $key));
}
return $results;
}
如果你使用的是(PHP 5 >= 5.5.0)，你不需要自己写函数来实现这个功能，只需要写这一行就可以了。
如果你只想要一个结果:
$key = array_search(40489, array_column($userdb, 'uid'));
对于多个结果
$keys = array_keys(array_column($userdb, 'uid'), 40489);
如果你有一个关联数组，就像注释中指出的那样，你可以用:
$keys = array_keys(array_combine(array_keys($userdb), array_column($userdb, 'uid')),40489);
如果你使用的是PHP < 5.5.0，你可以使用这个backport，谢谢ramsey!
更新:我一直在做一些简单的基准测试，多重结果表单似乎是最快的，甚至比Jakub自定义函数还要快!
我必须使用un函数来查找数组中的每个元素。所以我修改了Jakub truneeek的函数如下:
function search_in_array_r($needle, $array) {
$found = array();
foreach ($array as $key => $val) {
if ($val[1] == $needle) {
array_push($found, $val[1]);
}
}
if (count($found) != 0)
return $found;
else
return null;
}
这里有一句同样的句子，
$pic_square = $userdb[array_search($uid,array_column($userdb, 'uid'))]['pic_square'];
如果问题，即。
$a = [
[
"_id" => "5a96933414d48831a41901f2",
"discount_amount" => 3.29,
"discount_id" => "5a92656a14d488570c2c44a2",
],
[
"_id" => "5a9790fd14d48879cf16a9e8",
"discount_amount" => 4.53,
"discount_id" => "5a9265b914d488548513b122",
],
[
"_id" => "5a98083614d488191304b6c3",
"discount_amount" => 15.24,
"discount_id" => "5a92806a14d48858ff5c2ec3",
],
[
"_id" => "5a982a4914d48824721eafe3",
"discount_amount" => 45.74,
"discount_id" => "5a928ce414d488609e73b443",
],
[
"_id" => "5a982a4914d48824721eafe55",
"discount_amount" => 10.26,
"discount_id" => "5a928ce414d488609e73b443",
],
];
岁:
function searchForId($id, $array) {
$did=0;
$dia=0;
foreach ($array as $key => $val) {
if ($val['discount_id'] === $id) {
$dia +=$val['discount_amount'];
$did++;
}
}
if($dia != '') {
echo $dia;
var_dump($did);
}
return null;
};
print_r(searchForId('5a928ce414d488609e73b443',$a));
