在php中查找多维数组中有效键的数量
问题描述：
I need to know how many arrays have valid keys, how many arrays with valid keys in multidimensional array. Let me explain:
Input:
Array
(
[65] => Array
(
[1] => Array
(
[0] => Array
(
[mediumid] => 65
[mediumname] => VINYL
[trackid] => 525
[trackposition] => 1
[tracklocation] => SIDE A
[tracknumber] => 1
[trackname] => I love u
)
[1] => Array
(
[mediumid] => 65
[mediumname] => VINYL
[trackid] => 526
[trackposition] => 1
[tracklocation] => SIDE A
[tracknumber] => 2
[trackname] => Sun is yellow
)
)
[2] => Array
(
[0] => Array
(
[mediumid] => 65
[mediumname] => VINYL
[trackid] => 527
[trackposition] => 2
[tracklocation] => SIDE B
[tracknumber] => 1
[trackname] => Car red
)
[1] => Array
(
[mediumid] => 65
[mediumname] => VINYL
[trackid] => 528
[trackposition] => 2
[tracklocation] => SIDE B
[tracknumber] => 2
[trackname] => Lady in red
)
)
)
[769] => Array
(
[] => Array
(
[0] => Array
(
[mediumid] => 769
[mediumname] => DVD
[trackid] =>
[trackposition] =>
[tracklocation] =>
[tracknumber] =>
[trackname] =>
)
)
)
)
The mediums[65] next array contains 2 valid keys (1 and 2). The mediums[769] next array contains no valid keys
Therefore only mediums[65] contains valid keys, so total of arrays with valid keys = 1. I need to find that total. How ?
I've try using array_keys and array_filter, with no success (or either i'm doing it wrong)
答
<?php
$array=Array
(
65 => Array
(
1 => Array
(
0 => Array
(
"mediumid" => 65,
"mediumname" => "VINYL",
"trackid" => 525,
"trackposition" => 1,
"tracklocation" => "SIDE A",
"tracknumber" => 1,
"trackname" => "I love u"
),
1 => Array
(
"mediumid" => 65,
"mediumname" => "VINYL",
"trackid" => 526,
"trackposition" => 1,
"tracklocation" => "SIDE A",
"tracknumber" => 2,
"trackname" =>"Sun is yellow"
)
),
2 => Array
(
0 => Array
(
"mediumid" => 65,
"mediumname" => "VINYL",
"trackid" => 527,
"trackposition" => 2,
"tracklocation" => "SIDE B",
"tracknumber" => 1,
"trackname" => "Car red"
),
1 => Array
(
"mediumid" => 65,
"mediumname" => "VINYL",
"trackid" => 528,
"trackposition" => 2,
"tracklocation" => "SIDE B",
"tracknumber" => 2,
"trackname" => "Lady in red"
)
)
),
769 => Array
(
"" => Array
(
0 => Array
(
"mediumid" => 769,
"mediumname" => "DVD",
"trackid" => "",
"trackposition" => "",
"tracklocation" => "",
"tracknumber" =>"",
"trackname" => ""
)
)
)
);
$counter=0;
$trackedNull=false;
foreach($array as $key => $value)
{
$keys=array_keys($array[$key]);
foreach($keys as $arraykey)
{
if($arraykey=="")
{
$trackedNull=true;
break;
}
}
if($trackedNull==true)
{
$trackedNull=false;
}
else
{
$counter++;
}
}
echo $counter;