dsgsdg206050
2018-06-11 21:58 阅读 71
已采纳

在嵌套的多维数组中查找键值

I have an array data like this

    $array = Array ( 
         [abc] => Array ( ) 
         [def] => Array ( )
         [hij] => Array ( ) 
             [media] => Array ( 
                 [video_info] => Array ( ) 
                        [video_variants] => Array ( ) 
                                [1] => Array ( )
                                [2] => Array ( )
    ) 
) 

My code looks something like this

foreach($response->extended_entities->media as $media)
        {
        stuffs
           foreach ($media->video_info->variants as $video) 
               {
               stuffs
               }
        }

I want to check whether the "video_info Key is available in the array or not

I have tried this function but it doesn't work

function multi_array_key_exists($key, $array) {
    if (array_key_exists($key, $array))
        return true;
    else {
        foreach ($array as $nested) {
            foreach ($nested->media as $multinest) {
        if (is_array($multinest) && multi_array_key_exists($key, $multinest))
                return true;
        }
    }
    }
    return false;
}


 if (multi_array_key_exists('video_info',$response) === false)
    {
        return "failed";
    }

Please help me

Original array - https://pastebin.com/2Qy5cADF

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2条回答 默认 最新

  • 已采纳
    douchungu0859 douchungu0859 2018-06-11 22:25

    Here's my approach at writing a function to check the keys of your array using the Recursive Iterator classes...

    function isArrayKeyAnywhere( $array, $searchKey )
    {
      foreach( new RecursiveIteratorIterator( new RecursiveArrayIterator( $array ), RecursiveIteratorIterator::SELF_FIRST ) as $iteratorKey => $iteratorValue )
      {
        if( $iteratorKey == $searchKey )
        {
          return true;
        }
      }
      return false;
    }
    
    $array = [
      'abc'=>[],
      'def'=>[],
      'hij'=>[
        'media'=>[
          'video_info'=>[
            'video_variants'=>[
              [],
              []
            ]
          ]
        ]
      ]
    ];
    
    var_dump( isArrayKeyAnywhere( $array, 'video_info' ) ); // true
    var_dump( isArrayKeyAnywhere( $array, 'foo_bar' ) ); // false
    
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  • duanlie3187 duanlie3187 2018-06-11 22:21

    try something like this (recursion)

    $key = "video_info";
    $invoke = findKey($array, $key);
    
    function findKey($array, $key)
    {
        foreach ($array as $key0 => $value) {
            if (is_array($value)) {
                if ($key === $key0) {
                    echo 'hit: key ' . $key . ' is present in the array';
                    return true;
                }
                findKey($value, $key); // recursion
            } elseif ($key === $key0) {
                echo 'hit: key ' . $key . ' is present in the array';
                return true;
            } else {
                return false;
            }
        }
    }
    

    A small note: this function is significantly faster than the accepted answer (factor 4x)

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