PHP Array＆爲每個

Question

我在PHP中使用多維數組，我想知道如何獲得我在我的foreach循環中返回的值的「字段名稱」。

$_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。