tp5常用公共方法-二维数组去重（支持多字段同时匹配去重）

function moreArrayUnique($arr, $field = [], $allField = true)
{
    //必须是传入数组
    if (!is_array($field)) return false;

    //先把二维数组中的内层数组的键值记录在在一维数组中
    foreach ($arr[0] as $k => $v) $allField[] = $k;
    if ($field) {
        //按照顺序排字段名
        foreach ($allField as $key => $val) {
            if (!in_array($val, $field)) unset($allField[$key]);
        }
        $field = $allField;
    }

    foreach ($arr as $k => $v) {
        foreach ($v as $key => $item) {
            if (!in_array($key, $field)) unset($v[$key]);
        }
        //降维 用implode()也行
        $v = implode(",", $v);
        //保留原来的键值 $temp[]即为不保留原来键值
        $temp[$k] = $v;
    }

    //去重：去掉重复的元素
    $arr = array_unique($temp);
    if ($allField) {
        foreach ($arr as $k => $v) {
            //拆分后的重组 如：Array( [0] => 张三 [1] => 18 )
            $a = explode(",", $v);
            //将原来的键与值重新合并
            $arrAfter[] = array_combine($field, $a);
        }

    } else {
        //将键值保存为一维数组
        $allKey = array_keys($temp);
        $arrAfter = [];
        foreach ($arr as $k => $v) {
            //数组去重
            if (!in_array($k, $allKey)) {
                unset($arr[$k]);
            } else {
                $a = explode(",", $v);
                $arrAfter[] = array_combine($field, $a);
            }
        }
    }

    return $arrAfter ?? false;
}

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