我在学校的一个项目上遇到了困难。下面是我要做的::
作业:生日数学
第一部分
修改你的数学添加程序，要求用户输入2个数字并选择加法，减法，乘法或部门。
他们还必须对正确答案进行猜测。
您还必须处理用户尝试除法的可能性通过零…
在处理表单的页面上将他们的猜测与实际答案，告诉他们他们是对还是错。给他们用户友好、有趣、有创意、礼貌、有帮助的反馈。确保你显示从它们收集的所有表单信息。
提示:如果需要，可以使用switch语句，或者只是尝试嵌套if/else语句。
第二部分还要求他们输入他们的出生日期。
在表单中使用三个下拉列表来允许用户进行选择出生日期的月份、日期和年份。应该使用数组对于月份和每个列表都需要使用循环将值放入下拉列表。
如果用户在他们的出生日期访问你的网站，他们应该看到一个特殊的消息。
标准用户友好，有趣和创造性
所有的页面结构适当，并使用适当的HTML标签和用严格的XHTML语法验证HTML5。使用HTML LINT检查器检查语法错误。
表单被验证(检查它们是否为空)
任何包含表单的页面都使用PHP_SELF和Sticky表单
表单字段是可访问的，必要时使用fieldset
的每个脚本功能没有PHP错误或警告和工作适当的
所有PHP/HTML页面都包含适当的注释'空白'，使代码易于阅读(这包括'视图
所以，我已经完成了数学和单选按钮，但我正在努力的部分是生日部分。
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Howdy Stranger</title>
</head>
<body>
<h1>PHP_SELF</h1>
<?php
//process the form if the submit button was pressed
if (isset($_POST['submit'])) {
//form validation goes here
/////////////////////////////////////////VARIABLES ARE BEING MADE HERE
//simplify the form variables
//later on we will do this in form validation
//create a variable called firstname and store in it
//the value from the POST array for firstname from the form
$firstname = $_POST['firstname'];
//creating variables for num1 and num2 that user inputed
$num1 = $_POST['num1'];
$num2 = $_POST['num2'];
//creating a variable called guess and store it in the
//value from the POST array for the guess from the form
$guess = $_POST['guess'];
$month = $_POST['month'];
$year = $_POST['year'];
$day = $_POST['day'];
$date = $year ."-". $month ."-".$day;
$date = date("Y-m-d",strtotime($date));
if(date('m-d') == date('m-d', $date)) {
// today is users birthday. echo out "nice" message
echo "<p>Happy Birthday $firstname! You're nice and old now! Go have a good one!</p>'n";
} else {
echo "<p>Your birthday is on $date.</p>'n";
}
//creates the variable "sum"
//after user chooses certian "action" the sum will
//then be calculated using $num1 and $num2
if($_POST['action'] == "add") {
$sum = $num1 + $num2;
} else if($_POST['action'] == "subtract") {
$sum = $num1 - $num2;
} else if($_POST['action'] == "multiply") {
$sum = $num1 * $num2;
} else if($_POST['action'] == "divide") {
$sum = $num1 / $num2;
}
//echos out to the user and lets them know that they guessed correctly.
//also shows them their math
if ($sum == $guess) {
echo "<p>Congratulations $firstname. You answered correctly with $guess, using the numbers $num1 and $num2.<p>'n";
} else {
echo "<p>$firstname, you answered incorrectly. The correct answer is $sum.</p>'n";
}
} //end of the isset submit condional statement
//show the form if it is the user's first time her OR if any of the required forms are missing
if(!isset($_POST ['submit']) OR empty($firstname) OR empty($num1) OR empty($num2)) { ?>
<h2>Please fill out the following: </h2>
<!--FORM BEGINS-->
<form action= "<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
<p><label for="firstname">Please enter your first name: </label>
<input id="firstname" type="text" size="30" name="firstname" value="<?php if(isset($firstname)) echo $firstname; ?>"/><p>
<!--Challenge Dealio-->
<p><label for="Num1">Please enter a number: </label>
<input id="Num1" type="number" size="30" name="num1" value="<?php if(isset($num1)) echo $num1; ?>" /></p>
<p><label for="Num2">Please enter another number: </label>
<input id="Num2" type="number" size="30" name="num2" value="<?php if(isset($num2)) echo $num2; ?>"/><p>
<p>Please choose one of the following: </p>
<p>
<!--All radio buttons need the same "name" but with different values-->
<!--they each need their own special id too-->
<input name="action" id="add" type="radio" value="add" />Add<br />
<input name="action" id="subtract" type="radio" value="subtract" />Subtract<br />
<input name="action" id="multiply" type="radio" value="multiply" />Multiply<br />
<input name="action" id="divide" type="radio" value="divide" />Divide<br />
</p>
<p><label for="guess">Please put in a guess for the answer: </label>
<input id="guess" type="number" size="30" name="guess" value="<?php if(isset($guess)) echo $guess; ?>"/></p>
<!--option allows user to select the year they were born-->
<!--for simplicity sake, I am only doing from 1970-2015-->
<!--it would be way too many option values to make-->
<!--and would take up a lot of space in the code-->
<!--hope this works for you Charla-->
<select name="year" id="year">
<option value="1">1970</option>
<option value="2">1971</option>
<option value="3">1972</option>
<option value="4">1973</option>
<option value="5">1974</option>
<option value="6">1975</option>
<option value="7">1976</option>
<option value="8">1977</option>
<option value="9">1978</option>
<option value="10">1979</option>
<option value="11">1980</option>
<option value="12">1981</option>
<option value="13">1982</option>
<option value="14">1983</option>
<option value="15">1984</option>
<option value="16">1985</option>
<option value="17">1986</option>
<option value="18">1987</option>
<option value="19">1988</option>
<option value="20">1989</option>
<option value="21">1990</option>
<option value="22">1991</option>
<option value="23">1992</option>
<option value="24">1993</option>
<option value="25">1994</option>
<option value="26">1995</option>
<option value="27">1996</option>
<option value="28">1997</option>
<option value="29">1998</option>
<option value="30">1999</option>
<option value="31">2000</option>
<option value="32">2001</option>
<option value="33">2002</option>
<option value="34">2003</option>
<option value="35">2004</option>
<option value="36">2005</option>
<option value="37">2006</option>
<option value="38">2007</option>
<option value="39">2008</option>
<option value="40">2009</option>
<option value="41">2010</option>
<option value="42">2011</option>
<option value="43">2012</option>
<option value="44">2013</option>
<option value="45">2014</option>
<option value="46">2015</option>
</select>
<!--option allows user to select the month they were born.-->
<select name="month" id="month">
<option value="1">January</option>
<option value="2">February</option>
<option value="3">March</option>
<option value="4">April</option>
<option value="5">May</option>
<option value="6">June</option>
<option value="7">July</option>
<option value="8">August</option>
<option value="9">September</option>
<option value="10">October</option>
<option value="11">November</option>
<option value="12">December</option>
</select>
<select name="day" id="day">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
<option value="10">10</option>
<option value="11">11</option>
<option value="12">12</option>
<option value="13">13</option>
<option value="14">14</option>
<option value="15">15</option>
<option value="16">16</option>
<option value="17">17</option>
<option value="18">18</option>
<option value="19">19</option>
<option value="20">20</option>
<option value="10">21</option>
<option value="11">21</option>
<option value="12">22</option>
<option value="13">23</option>
<option value="14">24</option>
<option value="15">25</option>
<option value="16">26</option>
<option value="17">27</option>
<option value="18">28</option>
<option value="19">29</option>
<option value="20">30</option>
<option value="31">31</option>
</select>
<!--Submit Button-->
<input type="submit" name="submit" value="Enter" />
</form>
<?php
} //end form conditional statement
?>
</body>
</html>
现在必须有一种更简单的方法来输入所有的年，日，月等，可能使用数组…但我就是想不明白。
通过对数值使用for -循环，对月份使用foreach -循环(基于所有月份的数组)，您可以轻松地显示此内容。
- 一个
foreach-loop将循环遍历你调用它的数组的所有元素，你可以使用它来回显它们(或处理它们，但你只需要在这里回显它们)。 -
for循环将在数值之间循环，例如从1-31，根据您的分配需要。您可以选择一个起点和终点，以及每次循环结束时的增量(对于您的分配，这是1)。
这里的一个聪明的小功能是使用date()函数调用当前年份，因此您的脚本总是包含当前年份，而不必每年手动更新脚本。
下面是一个例子。
<?php
$months = array("January", "February", "March", "Apil", "May", "June",
"July", "August", "September", "October", "November", "Descember");
$yearFrom = 1950; // The first year included in the drop-down for years
// $yearFrom = date("Y")-80;
// Using this line instead, gives a dynamic range of years, always 80 years
// Echo out all years via a for-loop
echo '<select name="year" id="year">';
for ($yearFrom; $yearFrom <= date("Y"); $yearFrom++) {
// Each $yearFrom represent a year, always incremented by 1
echo "<option value='"$yearFrom'">$yearFrom</option>";
}
echo '</select>';
// Echo out all months from the array $months
echo '<select name="month" id="month">';
foreach($months as $key=>$value) {
// $key is the index of the array, starting at 0
$numericMonth = $key + 1;
echo "<option value='"$numericMonth'">$value</option>";
}
echo '</select>';
// Echo out all days (1-31) via a for-loop
echo '<select name="day" id="day">';
for ($i=1; $i <= 31; $i++) {
// Each $i represents a numeric value of days, from 1-31
echo "<option value='"$i'">$i</option>";
}
echo '</select>';
?>
关于$_SERVER['PHP_SELF']用法的快速注释:您应该对此小心，并且至少应该逃避它，因为它可以被利用。看看w3schools.com关于表单验证的讨论。