php二维数组按多个key进行排序

该功能更好的处理方式请参考：php二维数组按其中某一列排序

php二维数组按照多个key进行排序。

/**
 * @param $array
 * @param $cols
 * @return array
 */
function array_msort($array, $cols) {
    $colarr = array();
    foreach ($cols as $col => $order) {
        $colarr[$col] = array();
        foreach ($array as $k => $row) {
            $colarr[$col]['_' . $k] = strtolower($row[$col]);
        }
    }
    $eval = 'array_multisort(';
    foreach ($cols as $col => $order) {
        $eval .= '$colarr[\'' . $col . '\'],' . $order . ',';
    }
    $eval = substr($eval, 0, -1) . ');';
    eval($eval);
    $ret = array();
    foreach ($colarr as $col => $arr) {
        foreach ($arr as $k => $v) {
            $k = substr($k, 1);
            if (!isset($ret[$k])) $ret[$k] = $array[$k];
            $ret[$k][$col] = $array[$k][$col];
        }
    }
    return $ret;
}

使用示例：

$arr1 = array(
    array('id'=>1,'name'=>'aA','cat'=>'cc'),
    array('id'=>2,'name'=>'aa','cat'=>'dd'),
    array('id'=>3,'name'=>'bb','cat'=>'cc'),
    array('id'=>4,'name'=>'bb','cat'=>'dd')
);

$arr2 = array_msort($arr1, array('name'=>SORT_DESC, 'cat'=>SORT_ASC));