我正在使用 PHP，并且有一个看起来像这样的数组数组：答案

【问题标题】：I am working with PHP and have an Array of Arrays that looks something like this:我正在使用 PHP，并且有一个看起来像这样的数组数组：
【发布时间】：2014-05-11 18:05:35
【问题描述】：

Array
(
    [0] => Array
        (
            [gr_number] => 1
            [batch] => A
            [maths] => 80/100
            [english] => 80/100
            [science] => 80/100
            [hindi] => 80/100
            [computer] => 80/100
            [socialscience] => 85/100
        )

    [1] => Array
        (
            [gr_number] => 2
            [batch] => A
            [maths] => 80/100
            [english] => 80/100
            [science] => 80/100
            [hindi] => 80/100
            [computer] => 80/100
            [socialscience] => 86/100
        )

    [2] => Array
        (
            [gr_number] => 3
            [batch] => A
            [maths] => 80/100
            [english] => 80/100
            [science] => 80/100
            [hindi] => 80/100
            [computer] => 80/100
            [socialscience] => 87/100
        )

)

如您所见，它们是主数组中的一些主题元素，o 我想将所有主题元素合并到同一个数组中，像这样

Array
(
    [0] => Array
        (
            [gr_number] => 1
            [batch] => A
            [result_details] => maths : 80/100,english:80/100,science:80/100,hindi:80/100,computer:80/100,socialscience:85/100;
        )

    [1] => Array
        (
            [gr_number] => 2
            [batch] => A
            [result_details] => maths : 80/100,english:80/100,science:80/100,hindi:80/100,computer:80/100,socialscience:85/100;  
      )

    [2] => Array
        (
            [gr_number] => 3
            [batch] => A
            [result_details] => maths : 80/100,english:80/100,science:80/100,hindi:80/100,computer:80/100,socialscience:85/100;  
        )

)

【问题讨论】：

您必须将array_reduce (php.net/manual/en/function.array-reduce.php) 与array_map (php.net/manual/en/function.array-map.php) 结合使用
主题是静态的吗？每个数组中有相同的 6 个主题？

标签： php arrays multidimensional-array foreach merge

【解决方案1】：

您可以将array_map 与array_diff_key 和array_intersect_key 结合使用。有点像这样：

$keys = array('gr_number', 'batch');
$excludes = array_combine($keys, array_fill(0, count($keys), 0));
$result = array_map(
    function ($arr) use($excludes) {
        $ret = array_intersect_key($arr, $excludes);
        $arr = array_diff_key($arr, $excludes);
        $ret['result_details'] = implode(', ', array_map(
            function ($v1, $v2) { return "$v1:$v2"; },
            array_keys($arr), array_values($arr)
        ));
        return $ret;
    },
    $array
);

Demo

【讨论】：

【解决方案2】：

您可以简单地在 foreach 循环中添加一个新元素 result_details 与其他元素的组合值，然后取消设置您以后不需要的那些：

foreach($arr as &$val){
    $val['result_details']='maths:'.$val['maths'].',english:'.$val['english'].',science:'.$val['science'].',hindi:'.$val['hindi'].',computer:'.$val['computer'].',socialscience:'.$val['socialscience'];
    unset($val['maths'],$val['english'],$val['science'],$val['science'],$val['hindi'],$val['computer'],$val['socialscience']);
}

Demo

【讨论】：