<?php
/**
* ArrayHelper class file.
*
* @link http://www.yiiframework.com/
* @copyright Copyright © 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.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
class ArrayHelper
{
/**
* Merges two or more arrays into one recursively.
* 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
* @param array $b array to be merged from. You can specify additional
* arrays via third argument, fourth argument etc.
* @return array the merged array (the original arrays are not changed.)
*/
public static function merge($a, $b)
{
$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;
}
}
}
return $res;
}
/**
* 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, the default value will be returned instead.
*
* Below are some usage examples,
*
* ~~~
* // working with array
* $username = \yii\util\ArrayHelper::getValue($_POST, 'username');
* // working with object
* $username = \yii\util\ArrayHelper::getValue($user, 'username');
* // working with anonymous function
* $fullName = \yii\util\ArrayHelper::getValue($user, function($user, $defaultValue) {
* return $user->firstName . ' ' . $user->lastName;
* });
* ~~~
*
* @param array|object $array array or object to extract value from
* @param string|\Closure $key key name of the array element, or property name of the object,
* or an anonymous function returning the value. The anonymous function signature should be:
* `function($array, $defaultValue)`.
* @param mixed $default the default value to be returned if the specified key does not exist
* @return mixed the value of the
*/
public static function getValue($array, $key, $default = null)
{
if ($key instanceof \Closure) {
return $key($array, $default);
} elseif (is_array($array)) {
return isset($array[$key]) || array_key_exists($key, $array) ? $array[$key] : $default;
} else {
return $array->$key;
}
}
/**
* Indexes an array according to a specified key.
* The input array should be multidimensional or an array of objects.
*
* The key can be a key name of the sub-array, a property name of object, or an anonymous
* function which returns the key value given an array element.
*
* If a key value is null, the corresponding array element will be discarded and not put in the result.
*
* For example,
*
* ~~~
* $array = array(
* array('id' => '123', 'data' => 'abc'),
* array('id' => '345', 'data' => 'def'),
* );
* $result = ArrayHelper::index($array, 'id');
* // the result is:
* // array(
* // '123' => array('id' => '123', 'data' => 'abc'),
* // '345' => array('id' => '345', 'data' => 'def'),
* // )
*
* // using anonymous function
* $result = ArrayHelper::index($array, function(element) {
* return $element['id'];
* });
* ~~~
*
* @param array $array the array that needs to be indexed
* @param string|\Closure $key the column name or anonymous function whose result will be used to index the array
* @return array the indexed array
*/
public static function index($array, $key)
{
$result = array();
foreach ($array as $element) {
$value = static::getValue($element, $key);
$result[$value] = $element;
}
return $result;
}
/**
* Returns the values of a specified column in an array.
* The input array should be multidimensional or an array of objects.
*
* For example,
*
* ~~~
* $array = array(
* array('id' => '123', 'data' => 'abc'),
* array('id' => '345', 'data' => 'def'),
* );
* $result = ArrayHelper::getColumn($array, 'id');
* // the result is: array( '123', '345')
*
* // using anonymous function
* $result = ArrayHelper::getColumn($array, function(element) {
* return $element['id'];
* });
* ~~~
*
* @param array $array
* @param string|\Closure $key
* @return array the list of column values
*/
public static function getColumn($array, $key)
{
$result = array();
foreach ($array as $element) {
$result[] = static::getValue($element, $key);
}
return $result;
}
/**
* Builds a map (key-value pairs) from a multidimensional array or an array of objects.
* The `$from` and `$to` parameters specify the key names or property names to set up the map.
* Optionally, one can further group the map according to a grouping field `$group`.
*
* For example,
*
* ~~~
* $array = array(
* array('id' => '123', 'name' => 'aaa', 'class' => 'x'),
* array('id' => '124', 'name' => 'bbb', 'class' => 'x'),
* array('id' => '345', 'name' => 'ccc', 'class' => 'y'),
* );
*
* $result = ArrayHelper::map($array, 'id', 'name');
* // the result is:
* // array(
* // '123' => 'aaa',
* // '124' => 'bbb',
* // '345' => 'ccc',
* // )
*
* $result = ArrayHelper::map($array, 'id', 'name', 'class');
* // the result is:
* // array(
* // 'x' => array(
* // '123' => 'aaa',
* // '124' => 'bbb',
* // ),
* // 'y' => array(
* // '345' => 'ccc',
* // ),
* // )
* ~~~
*
* @param array $array
* @param string|\Closure $from
* @param string|\Closure $to
* @param string|\Closure $group
* @return array
*/
public static function map($array, $from, $to, $group = null)
{
$result = array();
foreach ($array as $element) {
$key = static::getValue($element, $from);
$value = static::getValue($element, $to);
if ($group !== null) {
$result[static::getValue($element, $group)][$key] = $value;
} else {
$result[$key] = $value;
}
}
return $result;
}
/**
* Searches the array for a given value and returns the corresponding key if found.
* This method is similar to array_search() with the enhancement that it can also
* search for strings in a case-insensitive manner.
* @param mixed $needle the value being searched for
* @param array $haystack the array to be searched through
* @param boolean $caseSensitive whether to perform a case-sensitive search
* @param boolean $strict whether to perform a type-strict search
* @return boolean|mixed the key of the value if it matches $needle. False if the value is not found.
*/
public static function search($needle, array $haystack, $caseSensitive = true, $strict = true)
{
if ($caseSensitive || !is_string($needle)) {
return array_search($needle, $haystack, $strict);
}
foreach ($haystack as $key => $value) {
if (is_string($value)) {
if (strcasecmp($value, $needle) === 0) {
return true;
}
} elseif ($strict && $key === $value || !$strict && $key == $value) {
return true;
}
}
return false;
}
}