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Helper_Array二位数组按照字段排序

未分类 小杰 3年前 (2015-12-22) 128次浏览 已收录 0个评论

<?php

/*
 * Created on 2015-12-22
 *
 * To change the template for this generated file go to
 * Window – Preferences – PHPeclipse – PHP – Code Templates
 */
class helperArray {
/**
* 根据指定的键对数组排序
*
* 用法:
* @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),
* );
*
* $rows = Helper_Array::sortByCol($rows, ‘id’, SORT_DESC);
* dump($rows);
* // 输出结果为:
* // 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 要排序的数组
* @param string $keyname 排序的键
* @param int $dir 排序方向
*
* @return array 排序后的数组
*/
static function sortByCol($array, $keyname, $dir = SORT_ASC) {
return self :: sortByMultiCols($array, array (
$keyname => $dir
));
}
/**
* 将一个二维数组按照多个列进行排序,类似 SQL 语句中的 ORDER BY
*
* 用法:
* @code php
* $rows = Helper_Array::sortByMultiCols($rows, array(
* ‘parent’ => SORT_ASC, 
* ‘name’ => SORT_DESC,
* ));
* @endcode
*
* @param array $rowset 要排序的数组
* @param array $args 排序的键
*
* @return array 排序后的数组
*/
static function sortByMultiCols($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;
}
}
?>


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