Retrieve value from multidimensional array using recursive keys [duplicate] - php

Question

Just as the title implies, I am trying to create a parser and trying to find the optimal solution to convert something from dot namespace into a multidimensional array such that
s1.t1.column.1 = size:33%
would be the same as
$source['s1']['t1']['column']['1'] = 'size:33%';

Answer 1

Try this number...
function assignArrayByPath(&$arr, $path, $value, $separator='.') {
$keys = explode($separator, $path);
foreach ($keys as $key) {
$arr = &$arr[$key];
}
$arr = $value;
}
CodePad
It will loop through the keys (delimited with . by default) to get to the final property, and then do assignment on the value.
If some of the keys aren't present, they're created.

Answer 2

FYI In Laravel we have a array_set() helper function which translates in this function
Method to store in an array using dot notation
/**
* Set an array item to a given value using "dot" notation.
*
* If no key is given to the method, the entire array will be replaced.
*
* #param array $array
* #param string $key
* #param mixed $value
* #return array
*/
public static function set(&$array, $key, $value)
{
if (is_null($key)) {
return $array = $value;
}
$keys = explode('.', $key);
while (count($keys) > 1) {
$key = array_shift($keys);
// If the key doesn't exist at this depth, we will just create an empty array
// to hold the next value, allowing us to create the arrays to hold final
// values at the correct depth. Then we'll keep digging into the array.
if (! isset($array[$key]) || ! is_array($array[$key])) {
$array[$key] = [];
}
$array = &$array[$key];
}
$array[array_shift($keys)] = $value;
return $array;
}
It's simple as
$array = ['products' => ['desk' => ['price' => 100]]];
array_set($array, 'products.desk.price', 200);
// ['products' => ['desk' => ['price' => 200]]]
You may check it in the docs
If you need to instead get the data using dot notation the process is a bit longer, but served on a plate by array_get() which translates to this function (actually the linked source shows you all the helper array related class)
Method to read from an an array using dot notation
/**
* Get an item from an array using "dot" notation.
*
* #param \ArrayAccess|array $array
* #param string $key
* #param mixed $default
* #return mixed
*/
public static function get($array, $key, $default = null)
{
if (! static::accessible($array)) {
return value($default);
}
if (is_null($key)) {
return $array;
}
if (static::exists($array, $key)) {
return $array[$key];
}
if (strpos($key, '.') === false) {
return $array[$key] ?? value($default);
}
foreach (explode('.', $key) as $segment) {
if (static::accessible($array) && static::exists($array, $segment)) {
$array = $array[$segment];
} else {
return value($default);
}
}
return $array;
}
As you can see, it uses two submethods, accessible() and exists()
/**
* Determine whether the given value is array accessible.
*
* #param mixed $value
* #return bool
*/
public static function accessible($value)
{
return is_array($value) || $value instanceof ArrayAccess;
}
And
/**
* Determine if the given key exists in the provided array.
*
* #param \ArrayAccess|array $array
* #param string|int $key
* #return bool
*/
public static function exists($array, $key)
{
if ($array instanceof ArrayAccess) {
return $array->offsetExists($key);
}
return array_key_exists($key, $array);
}
Last thing it uses, but you can probably skip that, is value() which is
if (! function_exists('value')) {
/**
* Return the default value of the given value.
*
* #param mixed $value
* #return mixed
*/
function value($value)
{
return $value instanceof Closure ? $value() : $value;
}
}

Answer 3

You can use this function to convert dot notation arrray to multidimensional array.
function flattenToMultiDimensional(array $array, $delimiter = '.')
{
$result = [];
foreach ($array as $notations => $value) {
// extract keys
$keys = explode($delimiter, $notations);
// reverse keys for assignments
$keys = array_reverse($keys);
// set initial value
$lastVal = $value;
foreach ($keys as $key) {
// wrap value with key over each iteration
$lastVal = [
$key => $lastVal
];
}
// merge result
$result = array_merge_recursive($result, $lastVal);
}
return $result;
}
Example:
$array = [
'test.example.key' => 'value'
];
print_r(flattenToMultiDimensional($array));
Output:
Array
(
[test] => Array
(
[example] => Array
(
[key] => value
)
)
)

Answer 4

I would suggest using dflydev/dot-access-data.
If you're not familiar with using Composer, head over to https://getcomposer.org/ for an introduction so that you can download and autoload the package as as dependency for your project.
Once you have the package, you can load a multi-dimensional array into a Data object:
use Dflydev\DotAccessData\Data;
$data = new Data(array(
's1' => array(
't1' => array(
'column' => array(
'1' => 'size:33%',
),
),
),
);
And access the values using dot notation:
$size = $username = $data->get('s1.t1.column.1');

Answer 5

You should try this one : https://symfony.com/doc/current/components/property_access.html
It allows you to access anything like arrays, objects, setters, getters, etc... with doted notation.
You can use it standalone without symfony. If your project use composer, it's a one line install.

Answer 6

Here is my solution:
<?php
// worked with any lvl
function unFlatArr($array, $delimiter = '_')
{
$result = [];
foreach ($array as $notations => $value) {
$keys = explode($delimiter, $notations);
$keys = array_reverse($keys);
$lastVal = $value;
foreach ($keys as $key) {
$lastVal = [$key => $lastVal];
}
// merge result
$result = array_merge_recursive($result, $lastVal);
}
return $result;
}
$array = ['s1.t1.column.1' => 'size:33%'];
var_export(unFlatArr($array, '.'));

Answer 7

Although pasrse_ini_file() can also bring out multidimensional array, I will present a different solution. Zend_Config_Ini()
$conf = new Zend_COnfig_Ini("path/to/file.ini");
echo $conf -> one -> two -> three; // This is how easy it is to do so
//prints one.two.three

Answer 8

I found a solution that worked for me at: Convert Flat PHP Array to Nested Array based on Array Keys and since I had an array based on an .ini file with different keys I made a tiny modification of that script and made work for me.
My array looked like this:
[resources.db.adapter] => PDO_MYSQL
[resources.db.params.host] => localhost
[resources.db.params.dbname] => qwer
[resources.db.params.username] => asdf
...
On request, this is the code that I described was working for me:
<?php
echo "remove the exit :-)"; exit;
$db_settings = parse_ini_file($_SERVER['DOCUMENT_ROOT'].'/website/var/config/app.ini');
echo "<pre>";
print_r($db_settings);
echo "</pre>";
$resources = array();
foreach ($db_settings as $path => $value) {
$ancestors = explode('.', $path);
set_nested_value($resources, $ancestors, $value);
}
echo "<pre>";
print_r($resources);
echo "</pre>";
/**
* Give it and array, and an array of parents, it will decent into the
* nested arrays and set the value.
*/
function set_nested_value(array &$arr, array $ancestors, $value) {
$current = &$arr;
foreach ($ancestors as $key) {
// To handle the original input, if an item is not an array,
// replace it with an array with the value as the first item.
if (!is_array($current)) {
$current = array( $current);
}
if (!array_key_exists($key, $current)) {
$current[$key] = array();
}
$current = &$current[$key];
}
$current = $value;
}
This is the source of the .ini file read by the parse_ini_file():
Array
(
[resources.db.adapter] => PDO_MYSQL
[resources.db.params.host] => localhost
[resources.db.params.dbname] => dbname
[resources.db.params.username] => dbname_user
[resources.db.params.password] => qwerqwerqwerqwer
[resources.db.params.charset] => utf8
[externaldb.adapter] => PDO_MYSQL
[externaldb.params.host] => localhost
[externaldb.params.dbname] => dbname2
[externaldb.params.username] => dbname_user2
[externaldb.params.password] => qwerqwerwqerqerw
[externaldb.params.charset] => latin1
)
This is the outcome of the code above:
Array
(
[resources] => Array
(
[db] => Array
(
[adapter] => PDO_MYSQL
[params] => Array
(
[host] => localhost
[dbname] => dbname
[username] => dbname_user
[password] => qwerqwerqwerqwer
[charset] => utf8
)
)
)
[externaldb] => Array
(
[adapter] => PDO_MYSQL
[params] => Array
(
[host] => localhost
[dbname] => dbname2
[username] => dbname_user2
[password] => qwerqwerwqerqerw
[charset] => latin1
)
)
)

Answer 9

I am pretty sure you are trying to do this to store some configuration data or similar.
I highly suggest you to save such file as .ini and use parse_ini_file() function to change the configuration data into a multidimensional array. As simple as this
$confArray = parse_ini_file("filename.ini");
var_dump($confArray);

Answer 10

Quick and dirty...
<?php
$input = 'one.two.three = four';
list($key, $value) = explode('=', $input);
foreach (explode('.', $key) as $keyName) {
if (false === isset($source)) {
$source = array();
$sourceRef = &$source;
}
$keyName = trim($keyName);
$sourceRef = &$sourceRef[$keyName];
}
$sourceRef = $value;
unset($sourceRef);
var_dump($source);