我得到了一项任务,要构建一个不使用JS的照片库,并且您有一个工作导航,可以在其中转到下一张或上一张照片。
我做了一个计数器,从1-6(图片数量)开始计数,然后我做了if statsment。也就是说,如果$costravel=1,2,3,4,5,6回显"那个img"。
它不起作用。当我打开echo时,我的计数器无法计数,刷新后同时显示ALL img!!该死。
代码的第一部分是会话
<?php
//$start = $_GET['value'];
//echo $start;
//$test = hej;
//echo $test;
session_start();
$_SESSION['ship'] = ((isset($_SESSION['ship'])) ?
$_SESSION['ship'] : 0);
if(isset($_GET['add'])){
$_SESSION['ship']++;
}
if(isset($_GET['sub'])){
$_SESSION['ship']--;
}
?>
这是代码,所以我循环浏览6个数字的
<?php
if ($_SESSION['ship'] > 6)
{
$_SESSION['ship'] = 1;
}
if ($_SESSION['ship'] < 1)
{
$_SESSION['ship'] = 6;
}
echo $_SESSION['ship']
?>
这是我的失败,我试图将每个数字附加到不同的图片上,并将其回声出来。
if ( $_SESSION['ship'] = 1 ) {
echo "<img src='"img/space/battlestar.jpg'"/>"; }
if ( $_SESSION['ship'] = 2 ) {
echo "<img src='"img/space/enterprise.jpg'"/>"; }
if ( $_SESSION['ship'] = 3 ) {
echo "<img src='"img/space/integrity.jpg'"/>"; }
if ( $_SESSION['ship'] = 4 ) {
echo "<img src='"img/space/millenium.jpg'"/>"; }
if ( $_SESSION['ship'] = 5 ) {
echo "<img src='"img/space/planetes.jpg'"/>"; }
if ( $_SESSION['ship'] = 6 ) {
echo "<img src='"img/space/serenity.jpg'"/>"; }
您的if语句不是检查相等性,而是设置ship的值。
所以要修复它,请使用这个:
if ( $_SESSION['ship'] === 1 ) {
echo "<img src='"img/space/battlestar.jpg'"/>"; }
if ( $_SESSION['ship'] === 2 ) {
echo "<img src='"img/space/enterprise.jpg'"/>"; }
if ( $_SESSION['ship'] === 3 ) {
echo "<img src='"img/space/integrity.jpg'"/>"; }
if ( $_SESSION['ship'] === 4 ) {
echo "<img src='"img/space/millenium.jpg'"/>"; }
if ( $_SESSION['ship'] === 5 ) {
echo "<img src='"img/space/planetes.jpg'"/>"; }
if ( $_SESSION['ship'] === 6 ) {
echo "<img src='"img/space/serenity.jpg'"/>"; }
编辑:最好也使用elseif,所以改为使用:
if ( $_SESSION['ship'] === 1 ) {
echo "<img src='"img/space/battlestar.jpg'"/>"; }
elseif ( $_SESSION['ship'] === 2 ) {
echo "<img src='"img/space/enterprise.jpg'"/>"; }
elseif ( $_SESSION['ship'] === 3 ) {
echo "<img src='"img/space/integrity.jpg'"/>"; }
elseif ( $_SESSION['ship'] === 4 ) {
echo "<img src='"img/space/millenium.jpg'"/>"; }
elseif ( $_SESSION['ship'] === 5 ) {
echo "<img src='"img/space/planetes.jpg'"/>"; }
elseif ( $_SESSION['ship'] === 6 ) {
echo "<img src='"img/space/serenity.jpg'"/>"; }
HTH;刻痕(ps.go萤火虫!)