Question

以下是我的代码。在我的代码的前半部分，您将看到变量$ question和$ row。当我回显$ question和/或$ row [0]时，我得到了返回的值。但是，在代码的底部我尝试将这些变量用作add_textbox函数中的实际参数。但是，add_textbox函数的作用就像那些变量为null。有人能告诉我我做错了什么。

<?php


$dbhost = 'localhost';

$uname = $_POST["uname"];

//***create connection object
$connection = mysql_connect($dbhost, "bc572482", "dfdfdfs")
    or die (mysql_error());

$dbname = "bc57";
mysql_select_db($dbname)
    or die (mysql_error());

// ***选择随机安全问题

//*** need this to import session variables
 session_start();

// echo ($_SESSION["ValidUser"] . '<br>');
 $uname =$_SESSION["ValidUser"];
  //echo ($uname . '<br>');

$rq = array('q1','q2','q3');
  $rand_key = array_rand($rq,1);
 // echo $rq[$rand_key];

 $question = $rq[$rand_key];

 $qtoanswer = mysql_query("select $question from users where uname = '$uname'");
 if(!$qtoanswer)
 {
    echo "Could not run query:"  . mysql_error();
    exit;
  }

 //echo ($qtoanswer . '<br>');
 $row = mysql_fetch_row($qtoanswer);

 //echo ($row[0] . abc);

 display_security();


 //functions to create security page
 function myprint($text)
 {
    print("$text \n");
 }

 //*** a bit of style
function add_style() 
{
  myprint("<link rel=\"stylesheet\" type=\"text/css\" href= \"main.css\" />");
 //myprint("<style type=text/css> * {font-family:arial;}   h3 {color:orange} </style>");
 }

//*** add a text box
function add_textbox($label, $name) 
{
   myprint("$label <br><input type=text name=$name><br>");
 }

   function add_submit($label) 
{
   myprint("<input type=submit name=submit value=$label>");
   myprint("<input type=reset value=Reset><br>");

}

//create the dynamic security page
function display_security()
{
    myprint("<html><head>");
    add_style();
    myprint("</head><body>");
    myprint("<h3> Feeding our Brothers and Sisters <br> Security Check</h3>"); 
    // get the security form created
    myprint("<form name=securityForm method=post action=login.php>");

     add_textbox($row[0],$question);
     add_submit("Login");


 myprint("</form>");

    myprint("</body></html>");

}

＆GT;

Answer 1

在调用此$row[0]函数时，将$question和display_security()作为函数参数传递

display_security($row[0], $question);

在display_security()中使用参数变量$p＆amp; $question

function display_security($p, $question)
{
    myprint("<html><head>");
    add_style();
    myprint("</head><body>");
    myprint("<h3> Feeding our Brothers and Sisters <br> Security Check</h3>");
    // get the security form created
    myprint("<form name=securityForm method=post action=login.php>");
    add_textbox($p,$question);
                ^^^ ^^^^^^^^
    add_submit("Login");
    myprint("</form>");
    myprint("</body></html>");

}

Answer 2

$question和$row是全局变量。在函数中，$question和$row是不是全局的局部变量。您可以拨打$GLOBALS或global关键字：

$question = 'this is a global variable';
$row = 'this is a global variable too';

function foo() {
    global $row;
    global $question;
    add_textbox($row[0], $question);
}

php使用变量作为php函数中的实际参数

2 个答案: