public static function getValue( $array, $key, $default = NULL ) {
		if ( $key instanceof \Closure ) {
			return $key( $array, $default );
		}
		if ( is_array( $key ) ) {
			$lastKey = array_pop( $key );
			foreach ( $key as $keyPart ) {
				$array = static::getValue( $array, $keyPart );
			}
			$key = $lastKey;
		}
		if ( is_array( $array ) && ( isset( $array[ $key ]) || array_key_exists( $key, $array ) ) ) {
			return $array[ $key ];
		}
		if ( ( $pos = strrpos( $key, '.') ) !== FALSE ) {
			$array = static::getValue( $array, substr( $key, 0, $pos ), $default );
			$key   = substr( $key, $pos + 1);
		}
		if ( is_object( $array ) ) {
			// this is expected to fail if the property does not exist, or __get() is not implemented
			// it is not reliably possible to check whether a property is accessable beforehand
			return $array->$key;
		} elseif ( is_array( $array ) ) {
			return ( isset( $array[ $key ]) || array_key_exists( $key, $array ) ) ? $array[ $key ] : $default;
		} else {
			return $default;
		}
	}
public static function getValue( $array, $key, $default = NULL ) {
		if ( $key instanceof \Closure ) {
			return $key( $array, $default );
		}
		if ( is_array( $key ) ) {
			$lastKey = array_pop( $key );
			foreach ( $key as $keyPart ) {
				$array = static::getValue( $array, $keyPart );
			}
			$key = $lastKey;
		}
		if ( is_array( $array ) && ( isset( $array[ $key ]) || array_key_exists( $key, $array ) ) ) {
			return $array[ $key ];
		}
		if ( ( $pos = strrpos( $key, '.') ) !== FALSE ) {
			$array = static::getValue( $array, substr( $key, 0, $pos ), $default );
			$key   = substr( $key, $pos + 1);
		}
		if ( is_object( $array ) ) {
			// this is expected to fail if the property does not exist, or __get() is not implemented
			// it is not reliably possible to check whether a property is accessable beforehand
			return $array->$key;
		} elseif ( is_array( $array ) ) {
			return ( isset( $array[ $key ]) || array_key_exists( $key, $array ) ) ? $array[ $key ] : $default;
		} else {
			return $default;
		}
	}
public static function getValue ( $ array , $ key , $ default = NULL ) { if ( $ key instanceof \ Closure ) { return $ key ( $ array , $ default ) ; } if ( is_array ( $ key ) ) { $ lastKey = array_pop ( $ key ) ; foreach ( $ key as $ keyPart ) { $ array = static :: getValue ( $ array , $ keyPart ) ; } $ key = $ lastKey ; } if ( is_array ( $ array ) && ( isset ( $ array [ $ key ] ) || array_key_exists ( $ key , $ array ) ) ) { return $ array [ $ key ] ; } if ( ( $ pos = strrpos ( $ key , '.' ) ) !== FALSE ) { $ array = static :: getValue ( $ array , substr ( $ key , 0 , $ pos ) , $ default ) ; $ key = substr ( $ key , $ pos + 1 ) ; } if ( is_object ( $ array ) ) { // this is expected to fail if the property does not exist, or __get() is not implemented // it is not reliably possible to check whether a property is accessable beforehand return $ array -> $ key ; } elseif ( is_array ( $ array ) ) { return ( isset ( $ array [ $ key ] ) || array_key_exists ( $ key , $ array ) ) ? $ array [ $ key ] : $ default ; } else { return $ default ; } }
Retrieves the value of an array element or object property with the given key or property name.
If the key does not exist in the array or object, the default value will be returned instead.

The key may be specified in a dot format to retrieve the value of a sub-array or the property
of an embedded object. In particular, if the key is `x.y.z`, then the returned value would
be `$array['x']['y']['z']` or `$array->x->y->z` (if `$array` is an object). If `$array['x']`
or `$array->x` is neither an array nor an object, the default value will be returned.
Note that if the array already has an element `x.y.z`, then its value will be returned
instead of going through the sub-arrays. So it is better to be done specifying an array of key names
like `['x', 'y', 'z']`.

Below are some usage examples,

```php
// working with array
$username = \yii\helpers\ArrayHelper::getValue($_POST, 'username');
// working with object
$username = \yii\helpers\ArrayHelper::getValue($user, 'username');
// working with anonymous function
$fullName = \yii\helpers\ArrayHelper::getValue($user, function ($user, $defaultValue) {
return $user->firstName . ' ' . $user->lastName;
});
// using dot format to retrieve the property of embedded object
$street = \yii\helpers\ArrayHelper::getValue($users, 'address.street');
// using an array of keys to retrieve the value
$value = \yii\helpers\ArrayHelper::getValue($versions, ['1.0', 'date']);
```

@param array|object $array array or object to extract value from
@param string|\Closure|array $key key name of the array element, an array of keys or property name of the object,
or an anonymous function returning the value. The anonymous function signature should be:
`function($array, $defaultValue)`.
The possibility to pass an array of keys is available since version 2.0.4.
@param mixed $default the default value to be returned if the specified array key does not exist. Not used when
getting value from an object.

@return mixed the value of the element if found, default value otherwise
@throws InvalidParamException if $array is neither an array nor an object.
Retrieves the value of an array element or object property with the given key or property name . If the key does not exist in the array or object the default value will be returned instead .