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我正在爲跑步速度計算器編寫代碼，如果有任何風，您可以選擇將此因子計入計算中，從而改變時間上如果逆風或順風HTML的使用基於以前的條件已經出現的表單的輸出進行計算
部分：
<form action="<?php echo $_SERVER['PHP_SELF']; ?>"
method="POST">
<input type="checkbox" id="windspeed" name="windspeed" value="windspeed">
<label for="windspeed">Any Wind?</label></p>
php腳本：
所以PHP的這一部分工作，它創建了所有與我需要的值的字段計算在逆風順風中失去/增加的速度：
$max=($_POST['distance']/$_POST['laplength']);
if (!empty($_POST['windspeed'])&&(empty($_POST['elevation'])))
{
echo "<p><label for=\"Windspeedvalue\">Wind Speed (mph): </label>
<input type=\"number\" id=\"Windspeedvalue\" name=\"Windspeedvalue\"></p> <br/>
<label for=\"height\">Height(cm):</label><input type=\"number\" id=\"height\" name=\"height\"></p><br/>
<label for=\"weight\">Weight(Kg):</label><input type=\"number\" id=\"weight\" name=\"weight\"></p><br/>";
$counter=1;
while($counter<=$max)
{
if (!empty($_POST['windspeed'])&&(empty($_POST['elevation'])))
{
echo "<br/>
<label for=\"WindDirection\">Lap $counter:</label>
<select name=\"WindDirection\">
<option value=\"\">Wind Direction...</option>
<option value=\"Tailwind $counter\">Tailwind</option>
<option value=\"Headwind $counter\">Headwind</option>
</select>";
$counter++;
}
echo"<input type=\"hidden\" name=\"Winddirectionhidden\" value=\"Winddirectionhidden\"><br/>";
}
echo "<br/>";
}
elseif (!empty($_POST['windspeed'])&&(!empty($_POST['elevation'])))
{
echo "<p><label for=\"Windspeedvalue\">Wind Speed (mph): </label>
<input type=\"number\" id=\"Windspeedvalue\" name=\"Windspeedvalue\"></p><br/>
<label for=\"height\">Height(cm):</label><input type=\"number\" id=\"height\" name=\"height\"></p><br/>
<label for=\"weight\">Weight(Kg):</label><input type=\"number\" id=\"weight\" name=\"weight\"></p><br/>";
}
但是，當我嘗試使用它來改變輸出表中的速度。它只讀取標題標題，未達到回顯TEST值，因此我知道它與第二個if/elseif語句或風向設置後有關。
if (!empty(($_POST['Windspeedvalue'])&&($_POST['Winddirectionhidden'])))
{
$max=$_POST['distance']/$_POST['laplength'];
$totalseconds=($_POST['minutes']*60)+($_POST['seconds']);
$paceinseconds=$totalseconds/$max;
$maxint=(integer)$max;
$pacelost=$_POST['Windspeedvalue']*$_POST['Height']*$_POST['Weight']*1.275;
$pacegained=$_POST['Windspeedvalue']*$_POST['Height']*$_POST['Weight']*(1.275/2);
$totalflattime=$totalseconds-$pacelost+$pacegained;
$flattimeperlap=$totalflattime/$_POST['distance'];
$laptimeinheadwind=$flattimeperlap-($pacelost/$_POST['distance']);
$laptimeintailwind=$flattimeperlap+($pacegained/$_POST['distance']);
echo "<table>";
echo "<tr><th>Lap Number</th><th>Time</th></tr>";
for($counter=1;$counter<=$maxint;$counter++)
{
if(isset($_POST['WindDirection']))
{
$tempperunitseconds=$unitpace*$counter;
$tempminutes=($tempperunitseconds/60);
$outminutes=(integer)$tempminutes;
$outseconds=(integer)(($tempminutes-$outminutes)*60);
printf("<tr><td>%02s</td><td>%02s.%02s</td></td>",$counter,$outminutes,$outseconds);
}
$direction=$_POST['WindDirection'];
if($direction=="Headwind")
{
echo 'TEST1';
$tempperunitseconds=$laptimeintailwind*$counter;
$tempminutes=($tempperunitseconds/60);
$outminutes=(integer)$tempminutes;
$outseconds=(integer)(($tempminutes-$outminutes)*60);
printf("<tr><td>%02s</td><td>%02s.%02s</td></td>",$counter,$outminutes,$outseconds);
}
elseif($direction=="Tailwind")
{
echo 'TEST2';
$tempperunitseconds=$laptimeinheadwind*$counter;
$tempminutes=($tempperunitseconds/60);
$outminutes=(integer)$tempminutes;
$outseconds=(integer)(($tempminutes-$outminutes)*60);
printf("<tr><td>%02s</td><td>%02s.%02s</td></td>",$counter,$outminutes,$outseconds);
};
}
echo "</table>";
}
您的輸入是否符合if語句的條件？通過在頁面上回應那些你會認出的東西來測試。然後用某種類型的字符串連接包裝windspeed值變量，並查看它的值，如果它爲空可能是問題 – Jeff