Get array's value by list of keys in PHP - php

Question

I have a simple methods to access to variables by their names in the class:
function get_value($name) {
return isset($this->vars[$name]) ? $this->vars[$name] : NULL;
}
function set_value($name, $value) {
//Some operations with value
$this->vars[$name] = $value;
}
But i want that vars would be a multidimensional array. Something like:
//$names = array('blocks', 'top', 1)
function get_value($names) {
//Try to return $this->vars['blocks']['top'][1]
}
I can access to value using loop like here https://stackoverflow.com/a/5127874/7462321 But "set_value" code will be uglier. Please, help to to come up with an elegant implementation of this.

Answer 1

Would a function like this be fine?
function get_value($arr, $keys) {
if (!is_array($keys)) {
$keys = [$keys];
}
foreach ($keys as $key) {
if (!isset($arr[$key])) {
return NULL;
}
$arr = $arr[$key];
}
return $arr;
}
Call it like this:
get_value($array, [1, 2, 3])
or:
get_value($array, 1)

Answer 2

Would this fit your needs ?
I had implemented something like this this way :
<?php
class Settings {
// [...] Some stuff
/**
* Sets a value to the corresponding key
* #throws SettingsException If $key is not well written
* #param string $key The depth slahes key
* #param mixed The value to set
*/
public function setValue($key, $value){
if(strpos($key, '/') !== false){
if(($key = trim(preg_replace('#[/]+#', '/', $key), ' /')) === ''){
throw new SettingsException('"' . $key . '" is not valid');
}
$this->_setValue($key, $this->_currentGroup, $value);
} else {
$this->_currentGroup[$key] = $value;
}
$this->_saved = false;
return $this;
}
/**
* Return a setting value
* #throws SettingsException If the key doesn't exists or is null
* #param string $key The depth slashes key
* #return mixed The value corresponding to the key
*/
public function value($key){
if(strpos($key, '/')){
if(($key = trim(preg_replace('#[/]+#', '/', $key), ' /')) === ''){
throw new SettingsException('"' . $key . '" is not valid');
}
return $this->_value($key, $this->_currentGroup, $key);
} else if(isset($this->_currentGroup[$key])) {
return $this->_currentGroup[$key];
} else {
throw new SettingsException('"' . $key . '" is not a valid key');
}
}
private function _setValue($key, &$configDepth, $value){
if(($pos = strpos($key, '/'))){
if(!isset($configDepth[($k = substr($key, 0, $pos))])) {
$configDepth[$k] = array();
}
$this->_setValue(substr($key, $pos+1), $configDepth[$k], $value);
} else {
$configDepth[$key] = $value;
}
}
private function _value($key, &$configDepth, $prefix){
if(($pos = strpos($key, '/'))){
if(!isset($configDepth[($k = substr($key, 0, $pos))])) {
throw new SettingsException('The prefix "' . $prefix . '" doesn\'t exists');
}
return $this->_value(substr($key, $pos+1), $configDepth[$k], $prefix);
} else if(!isset($configDepth[$key])) {
throw new SettingsException('The prefix "' . $prefix . '" doesn\'t exists');
} else {
return $configDepth[$key];
}
}
}
Settings and getting value works like the above :
<?php
$s = new Settings;
$s->setValue('main/foo', 'bar'); // $s::_s[main][foo] = bar;
$main = $s->value('main'); // return Setting like an array(foo => bar);
$bar = $s->value('main/foo'); // return string value bar
//$s['main'] == $s->value('main');
// $s['main']['foo'] = 'bar' == $s->setValue('main/foo', 'bar');