32.3.2　给答题评分

当用户在index.html中提交了题目的答案后，我们需要对答案进行评估，并且计算得分。这项工作是由score.php脚本程序完成的。该脚本代码如程序清单32-2所示。

程序清单32-2　score.php——评阅测验的脚本

＜?php

//create short variable names

$q1=$_POST['q1'];

$q2=$_POST['q2'];

$q3=$_POST['q3'];

$name=$_POST['name'];

//check that all the data was received

if(($q1=='')||($q2=='')||($q3=='')||($name=='')){

echo"＜h1＞

＜p align=\"center\"＞

＜img src=\"rosette.gif\"alt=\"\"/＞

Sorry:

＜img src=\"rosette.gif\"alt=\"\"/＞＜/p＞＜/h1＞

＜p＞You need to fill in your name and answer all questions.＜/p＞";

}else{

//add up the scores

$score=0;

if($q1==1){

//the correct answer for q1 is 1

$score++;

}

if($q2==1){

//the correct answer for q2 is 1

$score++;

}

if($q3==1){

//the correct answer for q3 is 1

$score++;

}

//convert score to a percentage

$score=$score/3*100;

if($score＜50){

//this person failed

echo"＜h1＞

＜p align=\"center\"＞

＜img src=\"rosette.gif\"alt=\"\"/＞

Sorry:

＜img src=\"rosette.gif\"alt=\"\"/＞＜/p＞＜/h1＞

＜p＞You need to score at least 50%to pass the exam.＜/p＞";

}else{

//create a string containing the score to one decimal place

$score=number_format($score,1);

echo"＜h1 align=\"center\"＞

＜img src=\"rosette.gif\"alt=\"\"/＞

Congratulations!

＜img src=\"rosette.gif\"alt=\"\"/＞＜/h1＞

＜p＞Well done".$name.",with a score of".$score."%,

you have passed the exam.＜/p＞";

//provide links to scripts that generate the certificates

echo"＜p＞Please click here to download your certificate as

a Microsoft Word(RTF)file.＜/p＞

＜form action=\"rtf.php\"method=\"post\"＞

＜div align=\"center\"＞

＜input type=\"image\"src=\"certificate.gif\"border=\"0\"＞

＜/div＞

＜input type=\"hidden\"name=\"score\"value=\"".$score."\"/＞

＜input type=\"hidden\"name=\"name\"value=\"".$name."\"/＞

＜/form＞

＜p＞Please click here to download your certificate as

a Portable Document Format(PDF)file.＜/p＞

＜form action=\"pdf.php\"method=\"post\"＞

＜div align=\"center\"＞

＜input type=\"image\"src=\"certificate.gif\"border=\"0\"＞

＜/div＞

＜input type=\"hidden\"name=\"score\"value=\"".$score."\"/＞

＜input type=\"hidden\"name=\"name\"value=\"".$name."\"/＞

＜/form＞

＜p＞Please click here to download your certificate as

a Portable Document Format(PDF)file generated with PDFLib.＜/p＞

＜form action=\"pdflib.php\"method=\"post\"＞

＜div align=\"center\"＞

＜input type=\"image\"src=\"certificate.gif\"border=\"0\"＞

＜/div＞

＜input type=\"hidden\"name=\"score\"value=\"".$score."\"/＞

＜input type=\"hidden\"name=\"name\"value=\"".$name."\"/＞

＜/form＞";

}

}

?＞

如果用户没有回答完所有问题，或者得分低于规定的及格线，该脚本显示一条消息。

如果用户成功地回答了问题，可以获得一个证书。一个成功测试的输出如图32-3所示。

图　32-3　score.php向成功回答问题的用户展示3种可供选择证书的选项

在这里，用户有3个选项。可以得到一个RTF证书，或者两个PDF证书之一。下面，我们分别介绍相应的脚本。