配列操作クラス
26338 ワード
class ArrayHelper{
/**
* （ ）
*
* ：
* @code php
* $arr = array('', 'test', ' ');
* ArrayHelper::removeEmpty($arr);
*
* dump($arr);
* // 'test'
* @endcode
*
* @param array $arr
* @param boolean $trim trim
*/
static function removeEmpty(& $arr, $trim = TRUE)
{
foreach ($arr as $key => $value)
{
if (is_array($value))
{
self::removeEmpty($arr[$key]);
}
else
{
$value = trim($value);
if ($value == '')
{
unset($arr[$key]);
}
elseif ($trim)
{
$arr[$key] = $value;
}
}
}
}
/**
*
*
* ：
* @code php
* $rows = array(
* array('id' => 1, 'value' => '1-1'),
* array('id' => 2, 'value' => '2-1'),
* );
* $values = ArrayHelper::getCols($rows, 'value');
*
* dump($values);
* //
* // array(
* // '1-1',
* // '2-1',
* // )
* @endcode
*
* @param array $arr
* @param string $col
*
* @return array
*/
static function getCols($arr, $col)
{
$ret = array();
foreach ($arr as $row)
{
if (isset($row[$col])) {
$ret[] = $row[$col];
}
}
return $ret;
}
/**
* HashMap，
*
* 1：
* @code php
* $rows = array(
* array('id' => 1, 'value' => '1-1'),
* array('id' => 2, 'value' => '2-1'),
* );
* $hashmap = ArrayHelper::toHashmap($rows, 'id', 'value');
*
* dump($hashmap);
* //
* // array(
* // 1 => '1-1',
* // 2 => '2-1',
* // )
* @endcode
*
* $valueField ， 。
*
* 2：
* @code php
* $rows = array(
* array('id' => 1, 'value' => '1-1'),
* array('id' => 2, 'value' => '2-1'),
* );
* $hashmap = ArrayHelper::toHashmap($rows, 'id');
*
* dump($hashmap);
* //
* // array(
* // 1 => array('id' => 1, 'value' => '1-1'),
* // 2 => array('id' => 2, 'value' => '2-1'),
* // )
* @endcode
*
* @param array $arr
* @param string $keyField
* @param string $valueField
*
* @return array HashMap
*/
static function toHashmap($arr, $keyField, $valueField = NULL)
{
$ret = array();
if ($valueField)
{
foreach ($arr as $row)
{
$ret[$row[$keyField]] = $row[$valueField];
}
}
else
{
foreach ($arr as $row)
{
$ret[$row[$keyField]] = $row;
}
}
return $ret;
}
/**
*
*
* ：
* @code php
* $rows = array(
* array('id' => 1, 'value' => '1-1', 'parent' => 1),
* array('id' => 2, 'value' => '2-1', 'parent' => 1),
* array('id' => 3, 'value' => '3-1', 'parent' => 1),
* array('id' => 4, 'value' => '4-1', 'parent' => 2),
* array('id' => 5, 'value' => '5-1', 'parent' => 2),
* array('id' => 6, 'value' => '6-1', 'parent' => 3),
* );
* $values = ArrayHelper::groupBy($rows, 'parent');
*
* dump($values);
* // parent
* // array(
* // 1 => array(
* // array('id' => 1, 'value' => '1-1', 'parent' => 1),
* // array('id' => 2, 'value' => '2-1', 'parent' => 1),
* // array('id' => 3, 'value' => '3-1', 'parent' => 1),
* // ),
* // 2 => array(
* // array('id' => 4, 'value' => '4-1', 'parent' => 2),
* // array('id' => 5, 'value' => '5-1', 'parent' => 2),
* // ),
* // 3 => array(
* // array('id' => 6, 'value' => '6-1', 'parent' => 3),
* // ),
* // )
* @endcode
*
* @param array $arr
* @param string $keyField
*
* @return array
*/
static function groupBy($arr, $keyField)
{
$ret = array();
foreach ($arr as $row)
{
$key = $row[$keyField];
$ret[$key][] = $row;
}
return $ret;
}
/**
*
*
* ：
* @code php
* $rows = array(
* array('id' => 1, 'value' => '1-1', 'parent' => 0),
* array('id' => 2, 'value' => '2-1', 'parent' => 0),
* array('id' => 3, 'value' => '3-1', 'parent' => 0),
*
* array('id' => 7, 'value' => '2-1-1', 'parent' => 2),
* array('id' => 8, 'value' => '2-1-2', 'parent' => 2),
* array('id' => 9, 'value' => '3-1-1', 'parent' => 3),
* array('id' => 10, 'value' => '3-1-1-1', 'parent' => 9),
* );
*
* $tree = ArrayHelper::tree($rows, 'id', 'parent', 'nodes');
*
* dump($tree);
* // ：
* // array(
* // array('id' => 1, ..., 'nodes' => array()),
* // array('id' => 2, ..., 'nodes' => array(
* // array(..., 'parent' => 2, 'nodes' => array()),
* // array(..., 'parent' => 2, 'nodes' => array()),
* // ),
* // array('id' => 3, ..., 'nodes' => array(
* // array('id' => 9, ..., 'parent' => 3, 'nodes' => array(
* // array(..., , 'parent' => 9, 'nodes' => array(),
* // ),
* // ),
* // )
* @endcode
*
* ， $refs ：
* @code php
* $refs = null;
* $tree = ArrayHelper::tree($rows, 'id', 'parent', 'nodes', $refs);
*
* // id 3
* $id = 3;
* dump($refs[$id]);
* @endcode
*
* @param array $arr
* @param string $keyNodeId ID
* @param string $keyParentId ID
* @param string $keyChildrens
* @param boolean $refs
*
* return array
*/
static function toTree($arr, $keyNodeId, $keyParentId = 'parent_id', $keyChildrens = 'childrens', & $refs = NULL)
{
$refs = array();
foreach ($arr as $offset => $row)
{
$arr[$offset][$keyChildrens] = array();
$refs[$row[$keyNodeId]] =& $arr[$offset];
}
$tree = array();
foreach ($arr as $offset => $row)
{
$parentId = $row[$keyParentId];
if ($parentId)
{
if (!isset($refs[$parentId]))
{
$tree[] =& $arr[$offset];
continue;
}
$parent =& $refs[$parentId];
$parent[$keyChildrens][] =& $arr[$offset];
}
else
{
$tree[] =& $arr[$offset];
}
}
return $tree;
}
/**
*
*
* tree() 。
*
* @param array $tree
* @param string $keyChildrens
*
* @return array
*/
static function treeToArray($tree, $keyChildrens = 'childrens')
{
$ret = array();
if (isset($tree[$keyChildrens]) && is_array($tree[$keyChildrens]))
{
foreach ($tree[$keyChildrens] as $child)
{
$ret = array_merge($ret, self::treeToArray($child, $keyChildrens));
}
unset($node[$keyChildrens]);
$ret[] = $tree;
}
else
{
$ret[] = $tree;
}
return $ret;
}
/**
*
*
* ：
* @code php
* $rows = array(
* array('id' => 1, 'value' => '1-1', 'parent' => 1),
* array('id' => 2, 'value' => '2-1', 'parent' => 1),
* array('id' => 3, 'value' => '3-1', 'parent' => 1),
* array('id' => 4, 'value' => '4-1', 'parent' => 2),
* array('id' => 5, 'value' => '5-1', 'parent' => 2),
* array('id' => 6, 'value' => '6-1', 'parent' => 3),
* );
*
* $rows = ArrayHelper::sortByCol($rows, 'id', SORT_DESC);
* dump($rows);
* // ：
* // array(
* // array('id' => 6, 'value' => '6-1', 'parent' => 3),
* // array('id' => 5, 'value' => '5-1', 'parent' => 2),
* // array('id' => 4, 'value' => '4-1', 'parent' => 2),
* // array('id' => 3, 'value' => '3-1', 'parent' => 1),
* // array('id' => 2, 'value' => '2-1', 'parent' => 1),
* // array('id' => 1, 'value' => '1-1', 'parent' => 1),
* // )
* @endcode
*
* @param array $array
* @param string $keyname
* @param int $dir
*
* @return array
*/
static function sortByCol($array, $keyname, $dir = SORT_ASC)
{
return self::sortByMultiCols($array, array($keyname => $dir));
}
/**
* ， SQL ORDER BY
*
* ：
* @code php
* $rows = ArrayHelper::sortByMultiCols($rows, array(
* 'parent' => SORT_ASC,
* 'name' => SORT_DESC,
* ));
* @endcode
*
* @param array $rowset
* @param array $args
*
* @return array
*/
static function sortByMultiCols($rowset, $args)
{
$sortArray = array();
$sortRule = '';
foreach ($args as $sortField => $sortDir)
{
foreach ($rowset as $offset => $row)
{
$sortArray[$sortField][$offset] = $row[$sortField];
}
$sortRule .= '$sortArray[\'' . $sortField . '\'], ' . $sortDir . ', ';
}
if (empty($sortArray) || empty($sortRule)) {
return $rowset;
}
eval('array_multisort(' . $sortRule . '$rowset);');
return $rowset;
}
}