PHP数组＆amp;为每个人

Question

我在php中使用多维数组，我想知道如何获取我在foreach循环中返回的值的“字段名称”。

$_SESSION['filter']['dateCreation'] = 'ASC';
$_SESSION['filter']['client'] = 'test';

print_r($_SESSION['filter']);
foreach ($_SESSION['filter'] as $filter)
{
    // how do I echo the name of the field here? Eg. dateCreation
    echo $filter;
}

Answer 1

foreach ($_SESSION['filter'] as $keyname => $filter)
echo "$keyname value is $filter\n";

Answer 2

foreach ($_SESSION['filter'] as $key => $value) ...

Answer 3

foreach ($_SESSION['filter'] as $field_name=>$filter)
{
    echo $field_name, $filter;
}

Answer 4

foreach ( $array as $key => value)
{
    ...
}

Php documentation