新手PHP的编码问题：头功能（也许，我需要有人来检查我的代码）

Question

考虑下面的PHP代码：

<?php 
$searchsport = $_REQUEST['sport']; 
$sportarray = array(
"Football" => "Fb01", 
"Cricket" => "ck32", 
"Tennis" => "Tn43", 
); 
header("Location: ".$sportarray[$searchsport].".html"); //directs user to the corresponding page they searched 
if ($searchsport == NULL) { 
header("Location: youtypednothing.html"); //directs user to a page I've set up to warn them if they've entered nothing 
} else { 
header("Location: sportdoesnotexist.html"); //if sport isn't in my root, a warning will appear 
} 
?> 

我觉得代码中的注释是不言自明的，基本上当我输入网球场我的form.html它会发送数据到这个php文件并处理，并指导我Tn43.html这是我的网球页面。不幸的是，它不起作用，我真的想知道为什么......（我知道我犯了一个非常愚蠢的错误）。

PS：头是正确的功能，当做一些重定向？

Answer 1

你应该重新定位你的代码了一下，修改过：

<?php 
$searchsport = $_REQUEST['sport']; 

$sportarray = array(
"Football" => "Fb01", 
"Cricket" => "ck32", 
"Tennis" => "Tn43", 
); 

if (!$searchsport) { 
header("Location: youtypednothing.html"); //directs user to a page I've set up to warn them if they've entered nothing 
exit; 
} elseif (!in_array($searchsport, $sportarray)) { 
header("Location: sportdoesnotexist.html"); //if sport isn't in my root, a warning will appear 
exit; 
} 

header("Location: ".$sportarray[$searchsport].".html"); //directs user to the corresponding page they searched 
exit; 
?> 

Answer 2

我认为你需要在你的头位置的绝对地址：...像http://yoursite.com/youtypednothing.html

Answer 3

记住头（ ）不会触发，直到脚本结束或您调用exit（）。所以我敢肯定，现在你的代码只说：

（伪）

If null, send to the null page, else send to the default page.

第一次检查将由全包第二的if/else覆盖。

尝试将支票放入带有退出的if/elseif/else块中。

Answer 4

您需要检查该密钥是否存在，然后您必须退出if语句。

<?php 
$searchsport = $_REQUEST['sport']; 
$sportarray = array(
"Football" => "Fb01", 
"Cricket" => "ck32", 
"Tennis" => "Tn43", 
); 

if(isset($sportarray[$searchsport])){ 
    header("Location: ".$sportarray[$searchsport].".html"); //directs user to the corresponding page they searched 
    die; 
} else { 
    if ($searchsport == NULL) { 
     header("Location: youtypednothing.html"); //directs user to a page I've set up to warn them if they've entered nothing 
     die; 
    } else { 
     header("Location: sportdoesnotexist.html"); //if sport isn't in my root, a warning will appear 
     die; 
    } 
} 
?>