无法在PHP中循环遍历数组

Question

I have an array that looks like this...

array(3) {
  [0]=>
  array(1) {
    [0]=>
    array(1) {
      ["@attributes"]=>
      array(1) {
        ["data"]=>
        string(23) "football games on today"
      }
    }
  }
  [1]=>
  array(1) {
    [0]=>
    array(1) {
      ["@attributes"]=>
      array(1) {
        ["data"]=>
        string(8) "football"
      }
    }
  }
  [2]=>
  array(1) {
    [0]=>
    array(1) {
      ["@attributes"]=>
      array(1) {
        ["data"]=>
        string(14) "football today"
      }
    }
  }
}

etc. Normally, I would just loop through this array to get the data that I need which would look like this...

$x=0;
foreach($array as $a){
    echo $a[$x][0]['@attributes']['data'].'<br>';
$x++;   
}

But, for some reason this very simple foreach loop will not output the data as I would expect. The loop returns nothing. I have add an

$x=0;
foreach($array as $d){
    echo $d[$x][0]['@attributes']['data'].'<br>';
  echo $x.'<br>';
$x++;   
}

echo $x; line into the code, and it will echo the incremental x value, so I know if is looping through the array properly.

It has been a very long few days of coding, so maybe I am just burnt out and missing somethings really simple. But I am not seeing it. Thank you for any help. It is much appreciated.

</div>

Answer 1

If you do end up with deeply nested arrays you can gather the keys and values of the array 'leaves', by using array_walk_recursive:

<?php

$data = 
[
    [
        [
            'wanted' => 'foo'
        ],
    ],
    [
        [
            'wanted'=> 'bar'
        ],
        'dead'=>'parrot'
    ]
];

array_walk_recursive($data, function($v, $k) use (&$wanteds) {
    if($k==='wanted')
        $wanteds[]=$v;
});
var_export($wanteds);

Output:

array (
    0 => 'foo',
    1 => 'bar',
  )

Note the conditional check on the leaf keys to only gather the attributes wanted.

You can then loop through the generated array easily.