dqouryz3595 2018-08-30 03:20
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PHP / CSS：未加载我的会话变量

I'm trying to load parameters with php(stored in my database) to update my css. After login, I start a session and load css in my header:

<head>      
<?PHP 
    define('THEME',  $_SESSION["theme"]);   
?>      
<link type="text/css" rel="stylesheet" href="./public_html/css/style.php" />
</head>

When I try to access test in style.php it doesn't work:

<?php
    header("Content-type: text/css; charset: UTF-8");
    switch(constant(THEME)){ something...}
?>

What am I doing wrong? Why can't I access my variable?

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3条回答 默认 最新

  • dsf1222 2018-08-30 13:56
    关注

    New Answer

    PHP Constants need to be generated when the page/script is generated and will only last for that script execution.

    IF you want constants (As here) which last over multiple script/page loads of your website you need to use $_SESSION (or $_COOKIE ) values to carry the variable from page to page.

    Thus:

    As you set your constant here:

    <?PHP 
    define('THEME',  $_SESSION["theme"]);   
?>

    Using a $_SESSION value; simply ignore the constant in your style.php page and use the session variable.

    Be sure to run session_start(); at the top of every script you want to read or write season data.

    thus:

    • style.php:

      <?php
    session_start(); //IMPORTANT! 
    header("Content-type: text/css; charset: UTF-8");
    switch($_SESSION["theme"]){ 
       case "a":
          ....
          break;
       case "b":
          ...
          etc.
       }
?>
<html>
     ....

    Old Answer

    Based on this answer you can do:

    switch (constant("__TEST__")){
     case "Ok":
        print "this constant is ".__TEST__;
        break;

     ...
}

    Please also note that double underscore constants (_ _ WORD _ _) are generally reserved and using this style for custom constants is frowned upon.

    Debug note:
    Do NOT print any PHP output before your header(...) statement. The header() MUST come before anything is output to the browser.

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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