此链接指向我的代码运行的位置。
http://erobi022.pairserver.com/phpvalidate1.php
<!DOC TYPE html>
<html>
<body>
This is a simple form
<form method="post" action="send_phpvalidate1.php">
Please enter your first name: <input type="text" name="First"></p>
Please enter your last name: <input type="text" name="Last"></p>
<button type="submit">Submit</button>
</form>
</body>
</html>
点击提交按钮后，所有数据将在此处发送和发布。我可以得到名字和姓氏来输出正常，但是如果我将它们留空，它只会说我把我的名字字段留空了。
http://erobi022.pairserver.com/send_phpvalidate1.php
<!DOCTYPE html>
<html>
<body>
Welcome,
</P>
<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
$name1 = $_POST["First"];
if (empty($name1)) {
echo "You've entered nothing for first name";
echo "<br>";
echo "<a href='phpvalidate1.php?text=hello>Click here to fix</a>";
die; //if you mess up, youll have to fix it
} else {
echo " Your first name is $name1 ";
}
}
echo "<br>";
if ($_SERVER["REQUEST_METHOD"] == "POST") {
$name2 = $_POST["Last"];
if (empty($name2)) {
echo "You've entered nothing for last name";
echo "<br>";
echo "<a href='phpvalidate1.php?text=hello>Click here to fix</a>";
die; //if you mess up, youll have to fix it
} else {
echo " Your last name is $name2 ";
}
}
?>
<?php // can have multiple php sections
echo "<a href='phpvalidate1.php'>Return to form</a></p>";
//have to use a simple qoute within html to make it work
?> </p>
<a href=".">Return to home page</a>
</body>
</html>
你可以用HTML 5使用它，简单
<!DOC TYPE html>
<html>
<body>
This is a simple form
<form method="post" action="send_phpvalidate1.php">
Please enter your first name: <input required="required" type="text" name="First"></p>
Please enter your last name: <input required="required" type="text" name="Last"></p>
<button type="submit">Submit</button>
</form>
</body>
</html>
不需要使用两个大if，只需将你的PHP代码替换为以下内容：
<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
$name1 = $_POST["First"];
$name2 = $_POST["Last"];
if (empty($name1) || empty($name2)) {
echo "Please complete both the fields.";
echo "<br>";
echo "<a href='phpvalidate1.php?text=hello>Click here to fix</a>";
die; //if you mess up, youll have to fix it
} else {
echo " Your name is $name1 $name2";
}
}
?>
首先，每当有 die（） 语句时，只有运行之前出现的代码，之后出现的代码不会运行（相对于你的代码）。
您也可以通过这种方式修剪代码，它仍然可以工作
<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
$name1 = $_POST["First"];
$name2 = $_POST["Last"];
if (empty($name1) || empty($name2)) {
echo "Please complete both the fields.";
echo "<br>";
echo "<a href='phpvalidate1.php?text=hello>Click here to fix</a>";
die; //if you mess up, youll have to fix it
} else {
echo " Your name is $name1 $name2";
}
}
?>