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;
}

看起来array_filter将是合适的解决方案…

$userdb=Array
(
    (0) => Array
        (
            (uid) => '100',
            (name) => 'Sandra Shush',
            (url) => 'urlof100'
        ),

    (1) => Array
        (
            (uid) => '5465',
            (name) => 'Stefanie Mcmohn',
            (pic_square) => 'urlof100'
        ),

    (2) => Array
        (
            (uid) => '40489',
            (name) => 'Michael',
            (pic_square) => 'urlof40489'
        )
);

PHP代码

<?php 
$search = 5465;
$found = array_filter($userdb,function($v,$k) use ($search){
  return $v['uid'] == $search;
},ARRAY_FILTER_USE_BOTH); // With latest PHP third parameter is optional.. Available Values:- ARRAY_FILTER_USE_BOTH OR ARRAY_FILTER_USE_KEY  

$values= print_r(array_values($found));
$keys =  print_r(array_keys($found)); 

for( $i =0; $i < sizeof($allUsers); $i++)
    {   
    $NEEDLE1='firstname';
    $NEEDLE2='emailAddress';
    $sterm='Tofind';
     if(isset($allUsers[$i][$NEEDLE1]) && isset($allUsers[$i][$NEEDLE2])
        {
            $Fname= $allUsers[$i][$NEEDLE1];
            $Lname= $allUsers[$i][$NEEDLE2];

            $pos1 = stripos($Fname, $sterm);
            $pos2=stripos($Lname, $sterm);//not case sensitive 

            if($pos1 !== false ||$pos2 !== false)
            {$resultsMatched[] =$allUsers[$i];}
            else
            {   continue;}              
        }

}
Print_r($resultsMatched); //will give array for matched values even partially matched

在上述代码的帮助下，可以从2D数组中的任何列中找到任何(部分匹配)数据，因此可以根据需要找到用户id。

虽然这是一个老问题，也有一个公认的答案，但我想对公认的答案提出一个改变。首先，我同意这个公认的答案是正确的。

function searchArrayKeyVal($sKey, $id, $array) {
   foreach ($array as $key => $val) {
       if ($val[$sKey] == $id) {
           return $key;
       }
   }
   return false;
}

将预设的“uid”替换为函数中的一个参数，因此现在调用下面的代码意味着您可以跨多个数组类型使用一个函数。零钱很小，但能带来细微的差别。

    // Array Data Of Users
$userdb = array (
    array ('uid' => '100','name' => 'Sandra Shush','url' => 'urlof100' ),
    array ('uid' => '5465','name' => 'Stefanie Mcmohn','url' => 'urlof100' ),
    array ('uid' => '40489','name' => 'Michael','url' => 'urlof40489' ),
);

// Obtain The Key Of The Array
$arrayKey = searchArrayKeyVal("uid", '100', $userdb);
if ($arrayKey!==false) {
    echo "Search Result: ", $userdb[$arrayKey]['name'];
} else {
    echo "Search Result can not be found";
}

PHP小提琴示例

$a = ['x' => ['eee', 'ccc'], 'b' => ['zzz']];

$found = null;
$search = 'eee';

array_walk($a, function ($k, $v) use ($search, &$found) {
    if (in_array($search, $k)) {
        $found = $v;
    }
});

var_dump($found);

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));