PHP array manipulation

php-json.php

<?php

/**
 * Author: Daniel Wilson <[email protected]> (https://github.com/danielrw7)
 * Gist: https://gist.github.com/danielrw7/63ee3faffb86613f379a
 */

function props($key) {
  $props = preg_split("/[\\.\\[\\]\\\"]/", trim($key));
  $result = array();
  foreach($props as $prop) {
    if (strlen($prop)) {
      $result[] = $prop;
    }
  }
  return $result;
}

function assoc_get($result, $key = "") {
  if (!$key) return $result;

  $props = props($key);
  foreach($props as $prop) {
    $result = is_array($result) && isset($result[$prop]) ? $result[$prop] : null;
  }

  return $result;
}

function assoc_set($result, $key, $value = null) {
  $tree = array(array($result));
  $props = props($key);

  foreach($props as $c => $prop) {
    $last = $tree[count($tree)-1][0];
    $set_value = ($c == count($props)-1);
    if ($set_value) {
      $tree[] = array(
        $value,
        $prop
      );
    } else {
      if (isset($last[$prop]) && is_array($prop)) {
        $tree[] = array(
          $last[$prop],
          $prop
        );
      } else {
        $tree[] = array(
          array(),
          $prop
        );
      }
    }
  }

  $value = $tree[count($tree)-1];
  for($i = count($tree)-2; $i >= 0; $i--) {
    $tree_item = $tree[$i];
    $tree_child = $value;
    $tree_item[0][$tree_child[1]] = $tree_child[0];
    $value = $tree_item;
  }

  return $value[0];
}

usage.php

<?php

assoc_get(array(
  "key1" => 1,
  "key2" => 2
), "key1");
// => 1

assoc_get(array(
  "nested" => array(
    "value" => 3
  )
), "nested.value");
// => 3

assoc_set(array(
  "x" => 1
), "x", 2);
// => array( "x" => 2 )

assoc_set(array(
  "nested" => array(
    "value" => 3
  )
), "nested.value", 5);
// => array( "nested" => array( "value" => 5 ) )