Array.php

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<?php
// FleaPHP Framework
//
// Copyright (c) 2005 - 2008 QeeYuan China Inc. (http://www.qeeyuan.com)
//
// 许可协议，请查看源代码中附带的 LICENSE.txt 文件，
// 或者访问 http://www.fleaphp.org/ 获得详细信息。

function array_remove_empty(& $arr, $trim = true)
{
    foreach ($arr as $key => $value) {
        if (is_array($value)) {
            array_remove_empty($arr[$key]);
        } else {
            $value = trim($value);
            if ($value == '') {
                unset($arr[$key]);
            } elseif ($trim) {
                $arr[$key] = $value;
            }
        }
    }
}

function array_col_values(& $arr, $col)
{
    $ret = array();
    foreach ($arr as $row) {
        if (isset($row[$col])) { $ret[] = $row[$col]; }
    }
    return $ret;
}

function array_to_hashmap(& $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;
}

function array_group_by(& $arr, $keyField)
{
    $ret = array();
    foreach ($arr as $row) {
        $key = $row[$keyField];
        $ret[$key][] = $row;
    }
    return $ret;
}

function array_to_tree($arr, $fid, $fparent = 'parent_id',
    $fchildrens = 'childrens', $returnReferences = false)
{
    $pkvRefs = array();
    foreach ($arr as $offset => $row) {
        $pkvRefs[$row[$fid]] =& $arr[$offset];
    }

    $tree = array();
    foreach ($arr as $offset => $row) {
        $parentId = $row[$fparent];
        if ($parentId) {
            if (!isset($pkvRefs[$parentId])) { continue; }
            $parent =& $pkvRefs[$parentId];
            $parent[$fchildrens][] =& $arr[$offset];
        } else {
            $tree[] =& $arr[$offset];
        }
    }
    if ($returnReferences) {
        return array('tree' => $tree, 'refs' => $pkvRefs);
    } else {
        return $tree;
    }
}

function tree_to_array(& $node, $fchildrens = 'childrens')
{
    $ret = array();
    if (isset($node[$fchildrens]) && is_array($node[$fchildrens])) {
        foreach ($node[$fchildrens] as $child) {
            $ret = array_merge($ret, tree_to_array($child, $fchildrens));
        }
        unset($node[$fchildrens]);
        $ret[] = $node;
    } else {
        $ret[] = $node;
    }
    return $ret;
}

function array_column_sort($array, $keyname, $sortDirection = SORT_ASC)
{
    return array_sortby_multifields($array, array($keyname => $sortDirection));
}

function array_sortby_multifields($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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