如何根据相同类型的键对数组进行分组答案

【问题标题】：How to group Array according to their same types keys如何根据相同类型的键对数组进行分组
【发布时间】：2014-11-03 12:58:03
【问题描述】：

我需要什么

我需要对相同类型的数组进行分组。
如array1 ['type']=a 和array2 ['type']=a，则应将其分组到单个数组中。

数组结构

 Array
(
[1] => Array
(
    [type] => ECOOP Conference, Workshops and UPMARC Summer School (Mon-Fri July 28 - August 1) Regular
    [amount] => 850
    [comment] => On or Before June 28, 2014
)

[2] => Array
(
    [type] => ECOOP Conference, Workshops and UPMARC Summer School (Mon-Fri July 28 - August 1) Friend
    [amount] => 1000
    [comment] => On or Before June 28, 2014
)

[3] => Array
(
    [type] => ECOOP Conference, Workshops and UPMARC Summer School (Mon-Fri July 28 - August 1) Student
    [amount] => 500
    [comment] => On or Before June 28, 2014
)

[4] => Array
(
    [type] => ECOOP Conference, Workshops and UPMARC Summer School (Mon-Fri July 28 - August 1) Regular)
    [amount] => 990
    [comment] => June 29 thru July 20, 2014
)

PHP 代码

foreach($data as $k=>$v){
    $type[$v['type']][]=$k;
}

//loop types, creating result array
foreach($type as $k=>$v){
    $tmp=array(
    'type'=>$kk,
    'metadata'=>array()
);

//loop all the arrays of this type
foreach($v as $w){
    //store in TMP
    $t=array(
        'amount' => $data[$w]['amount'],
        'comment' => $data[$w]['comment']
    );
    //store 
    $tmp['metadata'][]=$t;
}

$result[]=$tmp;

}

输出类型

[ECOOP Conference, Workshops and UPMARC Summer School (Mon-Fri July 28 - August 1) Regular] => Array
(
    [0] => 1
    [1] => 7
)

[ECOOP Conference, Workshops and UPMARC Summer School (Mon-Fri July 28 - August 1) Friend] => Array
(
    [0] => 2
    [1] => 5
    [2] => 8
)

[ECOOP Conference, Workshops and UPMARC Summer School (Mon-Fri July 28 - August 1) Student] => Array
(
    [0] => 3
    [1] => 6
    [2] => 9
)

[ECOOP Conference, Workshops and UPMARC Summer School (Mon-Fri July 28 - August 1) Regular)] => Array
(
    [0] => 4
)

我遇到了问题

[ECOOP Conference, Workshops and UPMARC Summer School (Mon-Fri July 28 - August 1) Regular] => Array
(
    [0] => 1
    [1] => 7
)

[ECOOP Conference, Workshops and UPMARC Summer School (Mon-Fri July 28 - August 1) Regular)] => Array
(
    [0] => 4
)

此数组具有相同类型但未分组。
我希望 ECOOP 会议、研讨会和 UPMARC 暑期学校（7 月 28 日周一至周五 - 8 月 1 日）定期分组。
如何解决这个问题，欢迎提出任何建议。

【问题讨论】：

您可以检查数组键是否存在，如果不创建数组，则您将新项目推入具有键类型的数组

标签： php arrays

【解决方案1】：

很可能是因为在其他值上多余的)：

ECOOP Conference, Workshops and UPMARC Summer School (Mon-Fri July 28 - August 1) Regular
ECOOP Conference, Workshops and UPMARC Summer School (Mon-Fri July 28 - August 1) Regular)
// extra `)` on the end

或者，您可以简单地通过修剪来修复它：

foreach($data as $k => $v){
    $type_val = rtrim($v['type'], ')');
    $type[$type_val][] = $k;
}

您可以像这样推送它们并将它们分组：

$new_data = array();
foreach($data as $k => $v){
    $type_val = rtrim($v['type'], ')');
    // simple initialize
    if(!isset($new_data[$type_val])) {
        $new_data[$type_val] = array(
            'amount' => 0,
            'comment' => array(),
        );
    }

    // push values
    $new_data[$type_val]['amount'] += $v['amount'];
    $new_data[$type_val]['comment'][] = $v['comment'] . "\n";
}

echo '<pre>';
print_r($new_data);

上面sn-p的Simple Output

【讨论】：

error PHP Warning: Illegal string offset 'ECOOP Conference, Workshops and UPMARC Summer School (Mon-Fri July 28 - August 1) Regular'
更新错误 PHP 致命错误：不能使用字符串偏移作为数组
@user3785613 我做了一些修改，请再试一次

【解决方案2】：

两种类型不一样

ECOOP Conference, Workshops and UPMARC Summer School (Mon-Fri July 28 - August 1) Regular
ECOOP Conference, Workshops and UPMARC Summer School (Mon-Fri July 28 - August 1) Regular) // extra `)` on the end

分组代码

$newArr = array();
foreach($array as $key=>$value) {
    $newArr[$value['type']][] = $value; 
}

【讨论】：