How to output the value of a specific key name in a two-dimensional array

How to output the value of a specific key name in a two-dimensional array
$url = ' http://quotes.money.163.com/hs/service/marketradar_ajax.php?page=0&query=STYPE%3AEQA&types= Jhjjfl&count=28&type=query ';
Match page number
$file =json_decode (file_get_contents ($url), true);
$out = $file [' list '];
$pageCount = (int) $file [' PageCount '];
Get the stock code for each page and put it in the appropriate array
for ($q =1; $q < $pageCount; $q + +) {
$url = ' http://quotes.money.163.com/hs/service/marketradar_ajax.php?page= '. $q. ' &query=stype%3aeqa&types= Jhjjfl&count=28&type=query ';
$file =json_decode (file_get_contents ($url), true);
foreach ($file [' list '] as $v) $out []= $v;
}
Var_export ($out);

How do I output a stock code with all the keys in the $out array named ' SYMBOL ' and put it in a new one-dimensional array

------Solution--------------------

PHP Code

$SYMBOLList = Array ();//container for ($q =1; $q < $pageCount; $q + +) {    $url = ' http://quotes.money.163.com/hs/service/ Marketradar_ajax.php?page= '. $q. ' &query=stype%3aeqa&types=jhjjfl&count=28&type=query ';    $file =json_decode (file_get_contents ($url), true);    foreach ($file [' list '] as $v) {        $out []= $v;        echo $v [' SYMBOL ']; can be output directly        $SYMBOLList [] = $v [' SYMBOL '];//after the array is saved}    }
------Solution--------------------
function Get_symbol ($ar) {
return $ar [' SYMBOL '];
}

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