Question

当我运行时，我总是得到:(什么是wdl形式）。

copy ("templates/colors/win.txt", "tips/$today/color.txt");
copy ("templates/text/win.txt", "tips/$today/wdl.txt");

这意味着最后的命令，我的php代码上的 if 不起作用。代码：

<?php
echo ("Setting up colors...");
if($_GET["wdl"] == "D");
{
    copy ("templates/colors/dr.txt", "tips/$today/color.txt");
    copy ("templates/text/dr.txt", "tips/$today/wdl.txt");
}
if($_GET["wdl"] == "L");
{
    copy ("templates/colors/lose.txt", "tips/$today/color.txt");
    copy ("templates/text/lose.txt", "tips/$today/wdl.txt");
}
if($_GET["wdl"] == "W");
{
    copy ("templates/colors/win.txt", "tips/$today/color.txt");
    copy ("templates/text/win.txt", "tips/$today/wdl.txt");
}
?>

我该如何解决？

解决方法是从;

中移除：ex：if($_GET["wdl"] == "W");

Answer 1

在;

之前移除if末尾的{

if($_GET["wdl"] == "D");
{

应该是

if($_GET["wdl"] == "D")
{

依旧......

;是一个指令分隔符。 Read more here

这是一个常见的错误区域，所以为了避免这种情况，你可以做到

if($_GET["wdl"] == "D") {
   ...

这样你可以在循环结构之后避免意外的;

所以代码块看起来像这样：

<?php
    echo ("Setting up colors...");
    if($_GET["wdl"] == "D") {
        copy ("templates/colors/dr.txt", "tips/$today/color.txt");
        copy ("templates/text/dr.txt", "tips/$today/wdl.txt");
    }
    if($_GET["wdl"] == "L") {
        copy ("templates/colors/lose.txt", "tips/$today/color.txt");
        copy ("templates/text/lose.txt", "tips/$today/wdl.txt");
    }
    if($_GET["wdl"] == "W") {
        copy ("templates/colors/win.txt", "tips/$today/color.txt");
        copy ("templates/text/win.txt", "tips/$today/wdl.txt");
    }
?>

Answer 2

if($_GET["wdl"] == "W");

由于;陈述后的分号（IF）

在所有IF语句后删除分号。它看起来像

if($_GET["wdl"] == "D") {
    copy ("templates/colors/dr.txt", "tips/$today/color.txt");
    copy ("templates/text/dr.txt", "tips/$today/wdl.txt");
}
if($_GET["wdl"] == "L") {
    copy ("templates/colors/lose.txt", "tips/$today/color.txt");
    copy ("templates/text/lose.txt", "tips/$today/wdl.txt");
}
if($_GET["wdl"] == "W") {
    copy ("templates/colors/win.txt", "tips/$today/color.txt");
    copy ("templates/text/win.txt", "tips/$today/wdl.txt");
}

Answer 3

试试这个：

if($_GET["wdl"] == "D"){
    copy ("templates/colors/dr.txt", "tips/$today/color.txt");
    copy ("templates/text/dr.txt", "tips/$today/wdl.txt");
}else if($_GET["wdl"] == "L"){
    copy ("templates/colors/lose.txt", "tips/$today/color.txt");
    copy ("templates/text/lose.txt", "tips/$today/wdl.txt");
}else if($_GET["wdl"] == "W"){
    copy ("templates/colors/win.txt", "tips/$today/color.txt");
    copy ("templates/text/win.txt", "tips/$today/wdl.txt");
}

您需要从;语句的末尾删除if，并且还可以将其设为else if，以防止它在匹配后测试剩余的语句。

Answer 4

是使用switch语句替换if的最佳方法

<?php
echo ("Setting up colors...");
switch($_GET["wdl"]) {
  case "D" :
       copy ("templates/colors/dr.txt", "tips/$today/color.txt");
       copy ("templates/text/dr.txt", "tips/$today/wdl.txt");
       break;
  case "W" :
     copy ("templates/colors/win.txt", "tips/$today/color.txt");
     copy ("templates/text/win.txt", "tips/$today/wdl.txt");
      break;
  case "L" :
     copy ("templates/colors/lose.txt", "tips/$today/color.txt");
     copy ("templates/text/lose.txt", "tips/$today/wdl.txt");
      break;
 }
?>

php IF在我的代码中不起作用

4 个答案: