Question

我有一些foreach的脚本，见下文，我的每个人总是从我的json对象中显示输出2 - 1 - 3 - 4 - 等，如何解决我的问题，？

<?php public function renderLayout3x3($data=array()){
    $output = "<ul>";

    foreach ($data as $key => $value) {
        if($value['posisi'] == '1'){
            $output .= "<li><ul>
                                <li>POS:".$value['posisi']."</li>
                                <li>HOSTNAME:".$value['hostname']."</li>
                        </ul></li>";
        }
        if($value['posisi'] == '2'){
            $output .= "<li><ul>
                                <li>POS:".$value['posisi']."</li>
                                <li>HOSTNAME:".$value['hostname']."</li>
                        </ul></li>";
        }
        if($value['posisi'] == '3'){
            $output .= "<li><ul>
                                <li>POS:".$value['posisi']."</li>
                                <li>HOSTNAME:".$value['hostname']."</li>
                        </ul></li>";
        }

        //for debug..
        print json_encode($value['posisi']);
        /*
        Output : "2","1","3","4","5","6","7","8","9"
        Why : 2 - 1 - 3 - etc, not 1 - 2 - 3 - etc 
        */
    }
    $output .= "</ul>";
    return $output;
}

$json_data = '{"ch":"79",
                "ipaddr":"172.16.11.100",
                "hostname":"TMC-MALL01",
                "posisi":"2",
                "monitorid":"17",
                "view_dimension":"2*2",
                "input_ipaddr":""
            }{
                "ch":"78",
                "ipaddr":"172.16.11.99",
                "hostname":"TMC-JSB01",
                "posisi":"1",
                "monitorid":"17",
                "view_dimension":"2*2",
                "input_ipaddr":""
            }{
                "ch":"80",
                "ipaddr":"172.16.11.101",
                "hostname":"TMC-MALL02",
                "posisi":"3",
                "monitorid":"17",
                "view_dimension":"2*2",
                "input_ipaddr":""
            }{
                "ch":"92",
                "ipaddr":"172.16.11.106",
                "hostname":"TMC-PALMA01",
                "posisi":"4",
                "monitorid":"17",
                "view_dimension":"2*2",
                "input_ipaddr":""
            }{
                "ch":"93",
                "ipaddr":"172.16.11.107",
                "hostname":"TMC-PALMA02",
                "posisi":"5",
                "monitorid":"17",
                "view_dimension":"2*2",
                "input_ipaddr":""
            }{
                "ch":"112",
                "ipaddr":"172.16.11.129",
                "hostname":"TMC-R.PRM01",
                "posisi":"6",
                "monitorid":"17",
                "view_dimension":"2*2",
                "input_ipaddr":""
            }{
                "ch":"113",
                "ipaddr":"172.16.11.130",
                "hostname":"TMC-R.PRM03",
                "posisi":"8",
                "monitorid":"17",
                "view_dimension":"2*2",
                "input_ipaddr":""
            }{
                "ch":"114",
                "ipaddr":"172.16.11.131",
                "hostname":"TMC-R.PRM02",
                "posisi":"7",
                "monitorid":"17",
                "view_dimension":"2*2",
                "input_ipaddr":""
            }{
                "ch":"115",
                "ipaddr":"172.16.11.132",
                "hostname":"TMC-R.PRM04",
                "posisi":"9",
                "monitorid":"17",
                "view_dimension":"2*2",
                "input_ipaddr":""
            }';

$render = renderLayout3x3($json_data);
print $render; ?>

总是输出：

Output : "2","1","3","4","5","6","7","8","9"

为什么：2 - 1 - 3 - 等，而不是1 - 2 - 3 - 等

这是其他输出：

Answer 1

这是因为如果你的代码中的语句不能决定你输出的顺序是什么。

您可以使用usort重新排列您的$数据，

usort(&$data, function($a, $b){return $a['posisi'] <=> $b['posisi'];});

Answer 2

您必须对数组进行排序，然后才能获得排序数组列表。你可以使用ksort（）函数来对你的数组进行排序

Answer 3

首先在你的字符串上有一个错误的json格式。如果您的json格式正确，那么就这样做

public function renderLayout3x3($data=array()){
    $data = json_decode($data); // decode json format to array

    // set posisi as index
    foreach ($data as $key => $value) 
    {
        $data[intval($value['posisi'])] = $value;
    }
    // sort index
    ksort($data);
    // get array values to data
    $data = array_values($data);

    $output = "";

    foreach ($data as $key => $value) {
        $output .= '<li><ul>
                        <li>POS:'.$value["posisi"].'</li>
                        <li>HOSTNAME:'.$value["hostname"].'</li>
                    </ul></li>';
    }
    return "<ul>$output</ul>";
}

Answer 4

定义了usort之后的输出案例。

Foreach迭代结构显示

4 个答案: