php实现网站四则运算。
1.设计思路：
在index.php中建立两个表单，有两个提交，一个跳转到fourArithmeticOperation.php，这里保存用户输入的参数到config.txt中，留给main函数调出。界面跳转到main.php。main.php执行简单四则运算。main.php中调用exercise类中的randomNumber函数，将生成的习题和结果写入到txt，main.php再读出显示给用户，待用户输入结果后，再输出判断结果。并将当前执行次数写入到time.txt。然后再次执行main.php。当time中的参数达到用户定制数量要求时，界面跳转到quit.php中，此处有一个按钮，点击界面跳转到load.php，执行下载exercise.txt文件。
另一个提交，跳转到multitermOperation.php，其思路与上面几乎相同，差别在main1.php调用的为exercise类中的randomFormula函数。
2.源代码
index.php
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<form method = "post" action = "fourArithmeticOperation.php">
简单四则运算 <input type = "submit" name = "continue" value = "简单四则运算"></form>
<form method = "post" action = "multitermOperation.php">
多项运算 <input type = "submit" name = "continue" value = "多项运算"></form>
<?php
if(isset($_REQUEST["continue"]))
{
}
?>
</html> fourArithmeticOperation.php
<!DOCTYPE html>
<html>
<head>
<meta charset = "UTF-8">
<title></title>
</head>
<form method = "get" action = "fourArithmeticOperation.php">
简单四则运算 <br>
习题数量 <input type = "text" name = "test1" > <br>
数值范围 <input type = "text" name = "test2" > <br>
<input type = "submit"></form>
<body>
<?php
if(isset($_REQUEST["test1"]) && (isset($_REQUEST["test2"])))
{
$open1 = fopen("config.txt","w+" ); //config.txt用于存放用户在表单输入的参数。
fwrite($open1,$_REQUEST["test1"]."\r\n".$_REQUEST["test2"]);
fclose($open1);
$open2 = fopen("time.txt","w+" ); //time.txt用于更新用户当前答题数量。
fwrite($open2,"0");
fclose($open2);
$open3 = fopen("exercise.txt","w+" ); //exercise.txt用于存放本次程序所出试题，同时用于判断是否有重复。
fclose($open3);
header("Refresh:0;url = main.php"); //配置完成后跳转到主程序页面。
}
?>
</body>
</html> multitermOperation.php
<!DOCTYPE html>
<html>
<head>
<meta charset = "UTF-8">
<title></title>
</head>
<form method = "get" action = "multitermOperation.php">
多项运算 <br>
习题数量 <input type = "text" name = "test3" > <br>
数值范围 <input type = "text" name = "test4" > <br>
<input type = "submit"></form>
<body>
<?php
if(isset($_REQUEST["test3"]) && (isset($_REQUEST["test4"])))
{
$open1 = fopen("config.txt","w+" ); //config.txt用于存放用户在表单输入的参数。
fwrite($open1,$_REQUEST["test3"]."\r\n".$_REQUEST["test4"]);
fclose($open1);
$open2 = fopen("time.txt","w+" ); //time.txt用于更新用户当前答题数量。
fwrite($open2,"0");
fclose($open2);
$open3 = fopen("exercise.txt","w+" ); //exercise.txt用于存放本次程序所出试题，同时用于判断是否有重复。
fclose($open3);
header("Refresh:0;url = main1.php"); //配置完成后跳转到主程序页面。
}
?>
</body>
</html> main.php
<?PHP
static $flag = true; //用于标记是否出题，逻辑上的变量。
$open0 = file("config.txt");
$range = chop($open0[1]); //读取随机数大小上限。
if(!(isset($_REQUEST["answer"])) && $flag) //出现回答后不再运行。
{
include("exercise.php");
$object = new exercise();
$object->randomNumber($range);
$flag = false;
} $open1 = fopen("exercise.txt",'r'); //读取exercise.txt的最后一行数据，即当前试题。
while($buf = fgets($open1))
{
$res = $buf;
}
fclose($open1);
echo $res; if(isset($_REQUEST["answer"])) //输出答案和输入结果。
{
echo file_get_contents("result.txt")."<br>"."您的结果为：".$_REQUEST["answer"]."<br>";
}
else
{
?>
<form method = "post">
<input type = "text" name = "answer"><br>
<input type = "submit"></form>
<?PHP
}
if(isset($_REQUEST["answer"])) //输入结果后进行判断。
{
judge($_REQUEST["answer"]); }
function judge($answer)
{
$result = file_get_contents("result.txt");
if($result == $answer)
{
echo "结果正确 ";
}
else
{
echo "结果错误 "; }
$open2 = file("config.txt");
$timeMax = chop($open2[0]); //读取习题数量。
$open3 = file("time.txt");
$time = chop($open3[0]); //读取当前为第几题。
if($time < $timeMax - 1) //习题未出完时，当前题数加一，更新time.txt，重新运行main.txt
{
echo "(第".($time + 1)."/".($timeMax)."题)";
$time++;
$open3 = fopen("time.txt","w+" );
fwrite($open3,"$time");
fclose($open3);
?>
<form method = "post" action = "main.php">
<input type = "submit" value = "下一题"></form>
<?PHP
}
else //否则跳转到退出界面。
{
echo "答题完毕。";
header("Refresh:3;url = quit.php");
}
} main1.php
<?PHP
static $flag = true; //用于标记是否出题，逻辑上的变量。
$open0 = file("config.txt");
$range = chop($open0[1]); //读取随机数大小上限。
if(!(isset($_REQUEST["answer1"])) && $flag) //出现回答后不再运行。
{
include("exercise.php");
$object = new exercise();
$object->randomFormula($range);
$flag = false;
} $open1 = fopen("exercise.txt",'r'); //读取exercise.txt的最后一行数据，即当前试题。
while($buf = fgets($open1))
{
$res = $buf;
}
fclose($open1);
echo $res; if(isset($_REQUEST["answer1"])) //输出答案和输入结果。
{
echo file_get_contents("result.txt")."<br>"."您的结果为：".$_REQUEST["answer1"]."<br>";
}
else
{
?>
<form method = "post">
<input type = "text" name = "answer1"><br>
<input type = "submit"></form>
<?PHP
}
if(isset($_REQUEST["answer1"])) //输入结果后进行判断。
{
judge($_REQUEST["answer1"]); }
function judge($answer)
{
$result = file_get_contents("result.txt");
if($result == $answer)
{
echo "结果正确 ";
}
else
{
echo "结果错误 "; }
$open2 = file("config.txt");
$timeMax = chop($open2[0]); //读取习题数量。
$open3 = file("time.txt");
$time = chop($open3[0]); //读取当前为第几题。
if($time < $timeMax - 1) //习题未出完时，当前题数加一，更新time.txt，重新运行main.txt
{
echo "(第".($time + 1)."/".($timeMax)."题)";
$time++;
$open3 = fopen("time.txt","w+" );
fwrite($open3,"$time");
fclose($open3);
?>
<form method = "post" action = "main1.php">
<input type = "submit" value = "下一题"></form>
<?PHP
}
else //否则跳转到退出界面。
{
echo "答题完毕。";
header("Refresh:3;url = quit.php");
}
} exercise.php
<?PHP
class exercise
{
public $numberA;
public $numberB;
public $numberC;
public $result;
public function exercise()
{
$this->numberA = null;
$this->numberB = null;
$this->result = null;
}
public function randomFormula($a)
{
$symbolA = rand(0,3);
$symbolB = rand(0,3);
$this->numberA = rand(0,$a);
$this->numberB = rand(0,$a);
$this->numberC = rand(0,$a);
$openA = fopen("exercise.txt","a" );
$openB = fopen("result.txt","w+" );
fwrite($openA,$this->numberA.symbol($symbolA).$this->numberB.symbol($symbolB).$this->numberC." = "."\r\n");
fwrite($openB,$this->result);
if($symbolA == 0)
{
if($symbolB == 0)
{
$this->result = $this->numberB + $this->numberC;
}
if($symbolB == 1)
{
$this->result = $this->numberB - $this->numberC;
}
if($symbolB == 2)
{
$this->result = $this->numberB * $this->numberC;
}
if($symbolB == 3)
{
$this->result = $this->numberB / $this->numberC;
}
$this->result += $this->numberA;
}
if($symbolA == 1)
{
if($symbolB == 0)
{
$this->result = $this->numberA - $this->numberB + $this->numberC;
}
if($symbolB == 1)
{
$this->result = $this->numberA - $this->numberB - $this->numberC;
}
if($symbolB == 2)
{
$this->result = $this->numberA - $this->numberB * $this->numberC;
}
if($symbolB == 3)
{
$this->result = $this->numberA - $this->numberB / $this->numberC;
}
} if($symbolA == 2)
{
if($symbolB == 0)
{
$this->result = $this->numberA * $this->numberB + $this->numberC;
}
if($symbolB == 1)
{
$this->result = $this->numberA * $this->numberB - $this->numberC;
}
if($symbolB == 2)
{
$this->result = $this->numberA * $this->numberB * $this->numberC;
}
if($symbolB == 3)
{
$this->result = $this->numberA * $this->numberB / $this->numberC;
}
} if($symbolA == 3)
{
if($symbolB == 0)
{
$this->result = $this->numberA / $this->numberB + $this->numberC;
}
if($symbolB == 1)
{
$this->result = $this->numberA / $this->numberB - $this->numberC;
}
if($symbolB == 2)
{
$this->result = $this->numberA / $this->numberB * $this->numberC;
}
if($symbolB == 3)
{
$this->result = $this->numberA / $this->numberB / $this->numberC;
}
}
fwrite($openB,$this->result);
fclose($openA);
fclose($openB); }
public function randomNumber($a)
{
$case2 = "0";
$symbol = rand(0,3);
$this->numberA = rand(0,$a);
$this->numberB = rand(0,$a);
$openA = fopen("exercise.txt","a" );
$openB = fopen("result.txt","w+" );
if($symbol == 0)
{
$this->result = $this->numberA + $this->numberB;
$case1 = $this->numberA." + ".$this->numberB." = "."\r\n";
$case2 = $this->numberB." + ".$this->numberA." = "."\r\n";
if(isRepeat($openA,$case1,$case2))
{
fwrite($openA,$this->numberA." + ".$this->numberB." = "."\r\n");
}
}
if($symbol == 1)
{
$this->numberB = rand(0,$this->numberA);
$case1 = $this->numberA." - ".$this->numberB." = "."\r\n";
$this->result = $this->numberA - $this->numberB;
if(isRepeat($openA,$case1,$case2))
{
fwrite($openA,$this->numberA." - ".$this->numberB." = "."\r\n");
}
}
if($symbol == 2)
{
$case1 = $this->numberA." * ".$this->numberB." = "."\r\n";
$case2 = $this->numberB." * ".$this->numberA." = "."\r\n";
$this->result = $this->numberA * $this->numberB;
if(isRepeat($openA,$case1,$case2))
{
fwrite($openA,$this->numberA." * ".$this->numberB." = "."\r\n");
}
}
if($symbol == 3)
{
$this->numberB = rand(1,$a);
$this->numberA = rand(1,$this->numberB);
$case1 = $this->numberA." / ".$this->numberB." = "."\r\n";
$gcd = getGreatestCommonDivisor($this->numberA,$this->numberB);
$this->result = ($this->numberA / $gcd)."/".($this->numberB / $gcd);
if($this->result == "1/1")
{
$this->result = "1";
}
if(isRepeat($openA,$case1,$case2))
{
fwrite($openA,$this->numberA." / ".$this->numberB." = "."\r\n");
}
}
fwrite($openB,$this->result);
fclose($openA);
fclose($openB);
} } function symbol($a)
{
$symbol = "";
switch($a)
{
case 0:
$symbol = " + ";break;
case 1:
$symbol = " - ";break;
case 2:
$symbol = " * ";break;
case 3:
$symbol = " / ";break;
}
return $symbol;
} function isRepeat($open1,$case1,$case2)
{
while($buf = fgets($open1))
{
if($buf == $case1 || $buf == $case2)
{
header("Refresh:0;url = main.php");
return false;
}
else
{
continue;
}
}
return true;
}
function getGreatestCommonDivisor($numberA,$numberB)
{
$n = 0;
while($numberB > 0)
{
$n = $numberA % $numberB;
$numberA = $numberB;
$numberB = $n;
}
return $numberA;
} quit.php
<?php
echo "欢迎再次使用！";
?>
<form method = "post" action = "load.php">
<input type = "submit" value = "下载习题"> load.php
<?php
$filename = "exercise.txt";
header('Content-Type‘txt'); //指定下载文件类型
header('Content-Disposition: attachment; filename="'.$filename.'"'); //指定下载文件的描述
header('Content-Length:'.filesize($filename)); //指定下载文件的大小
readfile($filename);//将文件内容读取出来并直接输出，以便下载
3.结果截图
4.难点分析
编码一开始难点就在如何使用表单中得到的值，如果提交到当前文件中，会使另一个文件中使用不了，即使提交到别的文件中，也很有局限性。所以实现一个数的运算及比较都花了很长时间。上网查了很多，后来发现可以存到txt中实现，虽然打开关闭的很麻烦，但好在逻辑上没错。后来在网上提问和web上机时，发现了session功能(还没有在php中尝试)。还有一些小问题也困扰过我，如不知道<?php ?>,if,else和表单之间的嵌套，不知道txt的读取打开方式和下载以及php中类的声明等等。
5.耗时
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