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Homephp教程php手册PHP和ASP中关于转向函数的区别

asp中实现重定向是用response.redirect函数:

  用法一例:
  response.redirect "../test.asp"

php中也有类似函数:header

  用法一例:
  header("location:../test.php");
但是两者是有区别的.

aspredirect函数可以在向客户发送头文件后起作用.

 如





查是php中下例代码会报错:



header("location:../test.php");
?>


只能这样:


header("location:../test.php");
?>
...

即header函数之前不能向客户发送任何数据.

   再看下面一例:

asp


response.redirect "../a.asp"
response.redirect "../b.asp"
%>


结果是重定向a.asp文件.

php呢?


header("location:../a.php");
header("location:../b.php");
?>


我们发现它重定向b.php.
原来在asp中执行redirect后不会再执行后面的代码.
而php在执行header后,继续执行下面的代码.
    在这方面上php中的header重定向不如asp中的重定向.有时我们要重定向后,不能执行后面的代码:

一般地我们用
if(...)
header("...");
else
{
...
}
但是我们可以简单的用下面的方法:
if(...)
{ header("...");break;}



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