PHP Convert array - php

Question

I am working with a permission system where I have to convert a single level array (separated by underscores) to a multidimentional array. Any help with a function that fix this?
Input array:
Array
(
[0] => dashboard
[1] => dashboard_read
[2] => dashboard_update
[3] => dashboard_create
[4] => dashboard_delete
[5] => dashboard_search
[6] => timeplan_event_read
[7] => timeplan_event_search
[8] => timeplan_read
[9] => timeplan_search
[10] => webhotel
[11] => webhotel_read
[12] => webhotel_update
[13] => webhotel_create
[14] => webhotel_delete
[15] => webhotel_search
)
Output array:
array(
'dashboard' => array(
'read',
'update',
'create',
'delete',
'search'
),
'timeplan' =>array(
'read',
'search',
'event' => array(
'read',
'search'
)
),
'webhotel' =>array(
'read',
'update',
'create',
'delete',
'search'
),
)

Answer 1

You can iterate through your array and explode on '_'-character. After this you can simple build up your new array in your desired treeformat.
<?php
$tmp = array("dashboard","dashboard_read","dashboard_update","dashboard_create","dashboard_delete","dashboard_search","timeplan_event_read","timeplan_event_search","timeplan_read","timeplan_search","webhotel","webhotel_read","webhotel_update","webhotel_create","webhotel_delete","webhotel_search");
$newarray = array();
foreach ($tmp as $value) {
$parts = explode("_", $value);
if (count($parts) < 2)
continue;
$arr = &$newarray;
for ($i=0;$i<count($parts)-1;$i++) {
if (!array_key_exists($parts[$i], $arr)) {
$arr[$parts[$i]] = array();
}
$arr = &$arr[$parts[$i]];
}
$arr[] = $parts[count($parts)-1];
}
print_r($newarray);
--- Output ---
$ php -f tmp.php
Array
(
[dashboard] => Array
(
[0] => read
[1] => update
[2] => create
[3] => delete
[4] => search
)
[timeplan] => Array
(
[event] => Array
(
[0] => read
[1] => search
)
[0] => read
[1] => search
)
[webhotel] => Array
(
[0] => read
[1] => update
[2] => create
[3] => delete
[4] => search
)
)

Answer 2

[akshay#localhost tmp]$ cat test.php
<?php
$array = array("dashboard","dashboard_read","dashboard_update","dashboard_create","dashboard_delete","dashboard_search","timeplan_event_read","timeplan_event_search","timeplan_read","timeplan_search","webhotel","webhotel_read","webhotel_update","webhotel_create","webhotel_delete","webhotel_search");
function build_arr($array, $delim='_')
{
$output = array();
foreach($array as $key)
{
$main = explode($delim, $key);
if (count($main) < 2)
continue;
$bottom = &$output;
while(count($main) > 1)
{
$sub = array_shift($main);
if (!isset($bottom[$sub]))
{
$bottom[$sub] = array();
}
$bottom = &$bottom[$sub];
}
$bottom[] = $main[count($main)-1];
}
return $output;
}
// Input
print_r( $array);
// Output
print_r( build_arr($array) );
?>
Output
[akshay#localhost tmp]$ php test.php
Array
(
[0] => dashboard
[1] => dashboard_read
[2] => dashboard_update
[3] => dashboard_create
[4] => dashboard_delete
[5] => dashboard_search
[6] => timeplan_event_read
[7] => timeplan_event_search
[8] => timeplan_read
[9] => timeplan_search
[10] => webhotel
[11] => webhotel_read
[12] => webhotel_update
[13] => webhotel_create
[14] => webhotel_delete
[15] => webhotel_search
)
Array
(
[dashboard] => Array
(
[0] => read
[1] => update
[2] => create
[3] => delete
[4] => search
)
[timeplan] => Array
(
[event] => Array
(
[0] => read
[1] => search
)
[0] => read
[1] => search
)
[webhotel] => Array
(
[0] => read
[1] => update
[2] => create
[3] => delete
[4] => search
)
)

Answer 3

I'd had the same problem times ago, but I don't know how the code exactly looks like. My idea was to write a recursive function, which explode('_', $string) the current permission, and iterates through the parts. And there it will do something like
if count $parts === 1:
$result[] = $parts
else:
$result[$parts[0]] = recursive call ($parts, $result)
I hope that this will bring you on the right way...

Answer 4

No depth limit.
$arr = [];
while($path = array_pop($x))
{
$parts = explode('_',$path);
$value = array_pop($parts);
$cell = &$arr;
while($part = array_shift($parts)){
if (!isset($cell[$part])) $cell[$part] = [];
$cell = &$cell[$part];
}
if (!array_key_exists($value, $cell))
array_push($cell, $value);
}
Output:
array:3 [
"webhotel" => array:5 [
0 => "search"
1 => "delete"
2 => "create"
3 => "update"
4 => "read"
]
"timeplan" => array:3 [
0 => "search"
1 => "read"
"event" => array:2 [
0 => "search"
1 => "read"
]
]
"dashboard" => array:5 [
0 => "search"
1 => "delete"
2 => "create"
3 => "update"
4 => "read"
]
]