Question

我有像这样的数组数据

library(ggplot2)
library(directlabels)

## Data
set.seed(10)
d <- data.frame(x=seq(1,100,1), y=rnorm(100, 3, 0.5))
d$z <- ifelse(d$y>3,1,0)

## Plot
p <- ggplot(d, aes(x=x, y=y, colour=as.factor(z))) +
  stat_smooth(inherit.aes=T, se=F, span=0.8, show.legend = T) +
  geom_line(colour="grey50") +
  scale_x_continuous(limits=c(0,110)) +
  geom_dl(label="text", method="maxvar.points", inherit.aes=T)
p

我的代码看起来像这样

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

我想检查＆＃34; video_info键是否在数组中可用

我已经尝试过这个功能，但它不起作用

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

请帮帮我

原始数组 - https://pastebin.com/2Qy5cADF

Answer 1

尝试这样的事情（递归）

$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;
        }
    }
}

小记：此功能明显快于接受的答案（因子4x）

Answer 2

这是我使用Recursive Iterator类编写函数来检查数组键的方法...

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

在嵌套的多维数组中查找键值

2 个答案: