如何检查多维数组中任意子数组的特定键是否存在特定值？

function existsKeyValue($myArray, $key, $value) {
    $queue = [$myArray]; //creating a queue of a single element, which is our outermost array

    //when we reach the count of the queue we looped all inner loops as well and failed to find the item
    for ($index = 0; $index < count($queue); $index++) {
        //Looping the current array, finding the key and the value
        foreach ($queue[$index] as $k => &$v) {
            //If they match the search, then we can return true
            if (($key === $k) && ($value === $v)) {
                return true;
            }
            //We need to make sure we did not already loop our current array to avoid infinite cycles
            if (is_array($v)) $queue[]=$v;
        }
    }
    return false;
}

$my_array = array(    
    0 =>  array(  
        "name"   => "john",  
        "id"    =>  4  
    ),  
    1   =>  array(  
        "name" =>  "mark",  
        "id" => 152  
    ), 
    2   =>  array(  
        "name" =>  "Eduard",  
        "id" => 152  
    )
);

echo var_dump(existsKeyValue($my_array, 'id', 152));

我不知道这对性能是好还是坏，但这里有一个替代方案：

$keys = array_map(function($element){return $element['id'];}, $my_array);
$flipped_keys = array_flip($keys);
if(isset($flipped_keys[40489]))
{
    // true
}

在以下示例中，只需使用array_column：

$my_array = [
    [
        "name"  => "john",  
        "id"    =>  4  
    ],  
    [
        "name"  =>  "mark",  
        "id"    => 152  
    ], 
    [
        "name"  =>  "Eduard",  
        "id"    => 152  
    ]
];
var_dump(in_array(152, array_column($my_array, 'id'))); // true

isset vs array_key_exists的区别是什么？ isset()和array_key_exists()有什么不同之处？

== vs ===的区别是什么？ PHP中的相等性（==双等号）和恒等性（===三等号）比较运算符有何不同之处？

function specificValue(array $array,$key,$val) {
    foreach ($array as $item)
        if (array_key_exits($item[$key]) && $item[$key] === $val)
            return true;
    return false;
}

尝试使用下面的代码。它应该适用于任何类型的多维数组搜索。

在这里你可以看到实时演示示例

function multi_array_search($search_for, $search_in) {
    foreach ($search_in as $element) {
        if ( ($element === $search_for) ){
            return true;
        }elseif(is_array($element)){
            $result = multi_array_search($search_for, $element);
            if($result == true)
                return true;
        }
    }
    return false;
}

你只需要使用两个参数即可

function whatever($array, $val) {
    foreach ($array as $item)
        if (isset($item) && in_array($val,$item))
            return 1;
    return 0;
}

function checkMultiArrayValue($array) {
        global $test;
        foreach ($array as $key => $item) {

            if(!empty($item) && is_array($item)) {
                checkMultiArrayValue($item);
            }else {
                if($item)
                 $test[$key] = $item;

            }
        }
        return $test;   
    }

 $multiArray = array(    
                0 =>  array(  
                      "country"   => "",  
                      "price"    => 4,  
                      "discount-price" => 0,  
               ),);

$test = checkMultiArrayValue($multiArray);
echo "<pre>"
print_r($test);

将返回具有索引和值的数组

function findKeyValue ($array, $needle, $value, $found = false){
    foreach ($array as $key => $item){
        // Navigate through the array completely.
        if (is_array($item)){
            $found = $this->findKeyValue($item, $needle, $value, $found);
        }

        // If the item is a node, verify if the value of the node contains
        // the given search parameter. E.G.: 'value' <=> 'This contains the value'
        if ( ! empty($key) && $key == $needle && strpos($item, $value) !== false){
            return true;
        }
    }

    return $found;
}

像这样调用函数：

$this->findKeyValue($array, $key, $value);