note 114584 added to function.array-keys
| From: | (maxianosathotmaildotcom) | Date: | Sun, 09 Mar 2014 03:41:52 +0000 |
| Subject: | note 114584 added to function.array-keys | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-198839@lists.php.net to get a copy of this message | ||
There's a lot of multidimensional array_keys function out there, but each of them only merges
all the keys in one flat array.
Here's a way to find all the keys from a multidimensional array while keeping the array
structure. An optional MAXIMUM DEPTH parameter can be set for testing purpose in case of very large
arrays.
NOTE: If the sub element isn't an array, it will be ignore.
<?php
function array_keys_recursive($myArray, $MAXDEPTH = INF, $depth = 0, $arrayKeys = array()){
if($depth < $MAXDEPTH){
$depth++;
$keys = array_keys($myArray);
foreach($keys as $key){
if(is_array($myArray[$key])){
$arrayKeys[$key] = array_keys_recursive($myArray[$key], $MAXDEPTH, $depth);
}
}
}
return $arrayKeys;
}
?>
EXAMPLE:
input:
array(
'Player' => array(
'id' => '4',
'state' => 'active',
),
'LevelSimulation' => array(
'id' => '1',
'simulation_id' => '1',
'level_id' => '1',
'Level' => array(
'id' => '1',
'city_id' => '8',
'City' => array(
'id' => '8',
'class' => 'home',
)
)
),
'User' => array(
'id' => '48',
'gender' => 'M',
'group' => 'user',
'username' => 'Hello'
)
)
output:
array(
'Player' => array(),
'LevelSimulation' => array(
'Level' => array(
'City' => array()
)
),
'User' => array()
)
----
Server IP: 216.235.13.26
Probable Submitter: 132.210.186.45
----
Manual Page -- http://php.net/manual/en/function.array-keys.php
Edit -- https://master.php.net/note/edit/114584
Del: integrated -- https://master.php.net/note/delete/114584/integrated
Del: useless -- https://master.php.net/note/delete/114584/useless
Del: bad code -- https://master.php.net/note/delete/114584/bad+code
Del: spam -- https://master.php.net/note/delete/114584/spam
Del: non-english -- https://master.php.net/note/delete/114584/non-english
Del: in docs -- https://master.php.net/note/delete/114584/in+docs
Del: other reasons-- https://master.php.net/note/delete/114584
Reject -- https://master.php.net/note/reject/114584
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