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:
$userdb = array(
array(
'uid' => '100',
'name' => 'Sandra Shush',
'pic_square' => 'urlof100'
),
array(
'uid' => '5465',
'name' => 'Stefanie Mcmohn',
'pic_square' => 'urlof100'
),
array(
'uid' => '40489',
'name' => 'Michael',
'pic_square' => 'urlof40489'
)
);
函数调用search_by_uid(100)(第一个用户的uid)应该返回0。
函数调用search_by_uid(40489)应该返回2。
我试着做循环,但我想要一个更快的执行代码。
function searchForId($id, $array) {
foreach ($array as $key => $val) {
if ($val['uid'] === $id) {
return $key;
}
}
return null;
}
这是可行的。你应该这样称呼它:
$id = searchForId('100', $userdb);
重要的是要知道,如果你使用===运算符比较类型必须完全相同,在这个例子中,你必须搜索字符串或使用==代替===。
根据安哥拉人的回答。在PHP的后续版本(>= 5.5.0)中,可以使用一行程序。
$key = array_search('100', array_column($userdb, 'uid'));
这里是文档:http://php.net/manual/en/function.array-column.php。
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));