Complete form example of PHP development basic tutorial
1. PHP complete form example
This chapter will introduce how to ensure that all fields are correct before clicking the "Submit" button to submit data. enter.
2. PHP - Ensure the entered value in the form
After the user clicks the submit button, in order to ensure that the field value is entered correctly, we Insert a PHP script into the HTML input element, and name each field: name, email, and website. In the textarea field in the note, we place the script between the <textarea> and </textarea> tags.
The PHP script output values ??are: $name, $email, $website, and $comment variables.
Then, we also need to check the selected radio button. For this, we must set the checked attribute (not the value attribute of the radio button):
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>"> 名字: <input type="text" name="name" value="<?php echo $name;?>"> <span>* <?php echo $nameErr;?></span> <br><br> E-mail: <input type="text" name="email" value="<?php echo $email;?>"> <span>* <?php echo $emailErr;?></span> <br><br> 網(wǎng)址: <input type="text" name="website" value="<?php echo $website;?>"> <span><?php echo $websiteErr;?></span> <br><br> 備注: <textarea name="comment" rows="5" cols="40"><?php echo $comment;?></textarea> <br><br> 性別: <input type="radio" name="gender" <?php if (isset($gender) && $gender=="female") echo "checked";?> value="female">女 <input type="radio" name="gender" <?php if (isset($gender) && $gender=="male") echo "checked";?> value="male">男 <span>* <?php echo $genderErr;?></span> <br><br> <input type="submit" name="submit" value="Submit"> </form>
3. PHP - Complete form example
##The complete code is as follows, you can copy it to run locally and observe the results
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>PHP.com</title>
<style>
.error {color: #FF0000;}
</style>
</head>
<body>
<?php
// 定義變量并默認設(shè)置為空值
$nameErr = $emailErr = $genderErr = $websiteErr = "";
$name = $email = $gender = $comment = $website = "";
//判斷是否是通過POST方式提交來的數(shù)據(jù)
if ($_SERVER["REQUEST_METHOD"] == "POST")
{
//判斷是否為空
if (empty($_POST["name"]))
{
$nameErr = "名字是必需的";
}
else
{
//有數(shù)據(jù)傳來，過濾里面的非法字符
$name = test_input($_POST["name"]);
// 檢測名字是否只包含字母跟空格
if (!preg_match("/^[a-zA-Z ]*$/",$name))
{
$nameErr = "只允許字母和空格";
}
}
if (empty($_POST["email"]))
{
$emailErr = "郵箱是必需的";
}
else
{
$email = test_input($_POST["email"]);
// 檢測郵箱是否合法
if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email))
{
$emailErr = "非法郵箱格式";
}
}
if (empty($_POST["website"]))
{
$website = "";
}
else
{
$website = test_input($_POST["website"]);
// 檢測 URL 地址是否合法
if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website))
{
$websiteErr = "非法的 URL 的地址";
}
}
if (empty($_POST["comment"]))
{
$comment = "";
}
else
{
$comment = test_input($_POST["comment"]);
}
if (empty($_POST["gender"]))
{
$genderErr = "性別是必需的";
}
else
{
$gender = test_input($_POST["gender"]);
}
}
//過濾數(shù)據(jù)的函數(shù)
function test_input($data)
{
//去除用戶輸入數(shù)據(jù)中不必要的字符 (如：空格，tab，換行)。
$data = trim($data);
//去除用戶輸入數(shù)據(jù)中的反斜杠 (\)
$data = stripslashes($data);
//把預定義的字符轉(zhuǎn)換為 HTML 實體
$data = htmlspecialchars($data);
return $data;
}
?>
<h2>PHP 表單驗證實例</h2>
<p><span>* 必需字段。</span></p>
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
名字: <input type="text" name="name" value="<?php echo $name;?>">
<span>* <?php echo $nameErr;?></span>
<br><br>
E-mail: <input type="text" name="email" value="<?php echo $email;?>">
<span>* <?php echo $emailErr;?></span>
<br><br>
網(wǎng)址: <input type="text" name="website" value="<?php echo $website;?>">
<span><?php echo $websiteErr;?></span>
<br><br>
備注: <textarea name="comment" rows="5" cols="40"><?php echo $comment;?></textarea>
<br><br>
性別:
<input type="radio" name="gender" <?php if (isset($gender) && $gender=="female") echo "checked";?> value="female">女
<input type="radio" name="gender" <?php if (isset($gender) && $gender=="male") echo "checked";?> value="male">男
<span>* <?php echo $genderErr;?></span>
<br><br>
<input type="submit" name="submit" value="Submit">
</form>
<?php
echo "<h2>您輸入的內(nèi)容是:</h2>";
echo $name;
echo "<br>";
echo $email;
echo "<br>";
echo $website;
echo "<br>";
echo $comment;
echo "<br>";
echo $gender;
?>
</body>
</html>
