Yii2 Bootstrap 3
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<?php
/**
* ArrayHelper class file.
*
* @link http://www.yiiframework.com/
* @copyright Copyright &copy; 2008-2012 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\util;
/**
* ArrayHelper provides additional array functionality you can use in your
* application.
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*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
class ArrayHelper extends \yii\base\Component
{
/**
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* Merges two or more arrays into one recursively.
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* If each array has an element with the same string key value, the latter
* will overwrite the former (different from array_merge_recursive).
* Recursive merging will be conducted if both arrays have an element of array
* type and are having the same key.
* For integer-keyed elements, the elements from the latter array will
* be appended to the former array.
* @param array $a array to be merged to
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* @param array $b array to be merged from. You can specify additional
* arrays via third argument, fourth argument etc.
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* @return array the merged array (the original arrays are not changed.)
*/
public static function merge($a, $b)
{
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$args = func_get_args();
$res = array_shift($args);
while ($args !== array()) {
$next = array_shift($args);
foreach ($next as $k => $v) {
if (is_integer($k)) {
isset($res[$k]) ? $res[] = $v : $res[$k] = $v;
} elseif (is_array($v) && isset($res[$k]) && is_array($res[$k])) {
$res[$k] = self::merge($res[$k], $v);
} else {
$res[$k] = $v;
}
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}
}
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return $res;
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}
/**
* Retrieves the value of an array element with the specified key.
*
* If the key does not exist in the array, the default value will be returned instead.
* For example,
*
* ~~~
* $username = \yii\util\ArrayHelper::get($_POST, 'username');
* ~~~
*
* @param array $array array to extract value from
* @param string $key key name of the array element
* @param mixed $default the default value to be returned if the specified key does not exist
* @return mixed
*/
public static function get($array, $key, $default = null)
{
return isset($array[$key]) || array_key_exists($key, $array) ? $array[$key] : $default;
}
}