使用else语句，每个循环使用两个 - using two for each loop with else statment

using two for each loop with else statment

本文关键字：两个循环 else 语句使用 | 更新日期: 2023-09-27

我有两个数组，其中Images的位置数组。当我对每个循环使用第一个时，我会从位置获得图像。如果我使用else语句，srpt将不起作用
我使用以下数组作为$image_name。

任何想法。

$cam_list1 = array(1,2,3,4,5,6,7,8);
$cam_list2 = array(9,10,11,12,13,14,15,16);

foreach ($cam_list1 as $cam) {
    $timestamp = strtotime($displayEntryDatetime);
    $cam_delta = 14;
    $timestamp = $timestamp - $cam_delta;
    for ($i = 0; $i < $cam_delta+2; $i++) {
        $cdate = date("d_m_Y* H_i_s", $timestamp);
        $image_name = "/xampp/htdocs" . $damage_topdir1. $cam . "/Cam*" . $cam . "*-" .$cdate . "*";
        foreach (glob($image_name) as $filename) {
            if (file_exists($filename)) {
                $fs_image = str_replace("/xampp/htdocs", "", $filename);
                print "<h3>Camera $cam</h3>";          
                print "<a href='"$fs_image'" target='"_new'"><img src='"$fs_image'" height=240 width=320 /></a>'n";
            }
        }
        $timestamp++;
    }
}
else 
    foreach ($cam_list2 as $cam) 
    {
        $timestamp = strtotime($displayEntryDatetime);
        $cam_delta = 14;
        $timestamp = $timestamp - $cam_delta;
        for ($i = 0; $i < $cam_delta+2; $i++) {
            $cdate = date("d_m_Y* H_i_s", $timestamp);
            $image_name = "/xampp/htdocs" . $damage_topdir2. $cam . "/Cam*" . $cam . "*-" .$cdate . "*";
            foreach (glob($image_name) as $filename) {
                if (file_exists($filename)) {
                    $fs_image = str_replace("/xampp/htdocs", "", $filename);
                    print "<h3>Camera $cam</h3>";          
                    print "<a href='"$fs_image'" target='"_new'"><img src='"$fs_image'" height=240 width=320 /></a>'n";
                }
            }
            $timestamp++;
        }
    }

如果您以前使用过if语句，则可以使用ELSE声明ONLY。在您的案例中会显示一个PHP致命错误。

我不清楚你想做什么，但如果你想检查你的列表中是否有图像，你可以在cam_list中使用一个函数来执行foreach过程。

function getImages($list) {
    $inList = false;
    foreach ($list as $cam) {
        $timestamp = strtotime($displayEntryDatetime);
        $cam_delta = 14;
        $timestamp = $timestamp - $cam_delta;
        for ($i = 0; $i < $cam_delta+2; $i++) {
            $cdate = date("d_m_Y* H_i_s", $timestamp);
            $image_name = "/xampp/htdocs" . $damage_topdir1. $cam . "/Cam*" . $cam . "*-" .$cdate . "*";
            foreach (glob($image_name) as $filename) {
                if (file_exists($filename)) {
                    $inList = true;
                    $fs_image = str_replace("/xampp/htdocs", "", $filename);
                    print "<h3>Camera $cam</h3>";          
                    print "<a href='"$fs_image'" target='"_new'"><img src='"$fs_image'" height=240 width=320 /></a>'n";
                }
            }
            $timestamp++;
        }
    }
    return ($inList) ? true : false;
}

使用if/else，您可以在cam_list1或cam_list2中获取图像。

$cam_list1 = array(1,2,3,4,5,6,7,8);
$cam_list2 = array(9,10,11,12,13,14,15,16);
if (!getImages($cam_list1)) {
    getImages($cam_list2);
}