Create infinitely deep multidimensional array from string in PHP [duplicate] - php

Question

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Closed 10 years ago.
Possible Duplicate:
String with array structure to Array
I have a string "db/yum/user", and I'm trying to explode it so each element of / becomes a deeper dimension.
So the direct method of creating the data variable would be
$config['db']['yum']['user'] = "val";
My attempt so far:
$config = array();
function set_config($key,$value){
global $config;
//Multi deminsional config
$multi_configs = explode('/',$key);
if($multi_configs!==false){
$build_up = array();
$c =& $build_up;
foreach($multi_configs as $multi_config){
$c[$multi_config] = array();
$c =& $c[$multi_config];
}
//$c = $value;
array_merge($config,$c);
return;
}
$config[$key] = $value;
}
set_config('db/yum/user','val');
set_config('db/yum/server','val2');
//etc,etc,etc, this was modified to make more sense in this context.

Answer 1

This is probably what you are looking for:
#!/usr/bin/php
<?php
$config = array();
function set_config($key, $value) {
global $config;
if (FALSE=== ($levels=explode('/',$key)))
return;
$pointer = &$config;
for ($i=0; $i<sizeof($levels); $i++) {
if (!isset($pointer[$levels[$i]]))
$pointer[$levels[$i]]=array();
$pointer=&$pointer[$levels[$i]];
} // for
$pointer=$value;
} // set_config
set_config('db/yum/user','val');
set_config('db/yum/server','val2');
print_r($config);
?>
The output is:
Array
(
[db] => Array
(
[yum] => Array
(
[user] => val
[server] => val2
)
)
)

Answer 2

You can also achieve the same solution using a tree structure in the array . Here is the code to construct the array :
$arr = array (5,6);
$new_arr=array ();
$prev=0;
foreach ($arr as $val) {
$new_arr[$prev] = $val;
$prev=$val;
}
$new_arr[$prev]="value";
Here is the code to retrieve the value:
function retrieve ($arr) {
$prev=0;
while (1) {
if (! isset($arr[$prev] ) )
break;
else $prev = $arr[$prev];
}
return $prev;
}