web前后端交互 这里我自己创建了一个表单文件，用来交互信息。
- 前后端交互
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>shine</title>
<style>
.adc{
color: red;
}
}
</style>
</head>
<body>
<?php
//定义变量并默认值设置为空,所有变量初始化
$name=$email=$web=$notes=$wm="";
$nameErr=$emailErr=$webErr=$wmErr="";
//访问页面请求方式 REQUEST请求的意思 METHOD代表交互请求
if($_SERVER['REQUEST_METHOD']=="POST"){
//传输值进来，判断name值是否为空
if(empty($_POST["name"])){
$nameErr = "名字是必填选项";
}else{
//否则传入name值
$name = abc($_POST["name"]);
//正则表达式，检测名字是否包含字母和空格/^[a-zA-Z]*$/
if(!preg_match("/^[a-zA-Z]*$/",$name)){
$nameErr="名字只能输入字母和空格";
}
}
if(empty($_POST["email"])){
$emailErr = "请输入邮箱";
}else{
//否则传入email值
$email = abc($_POST["email"]);
//正则表达式，检测邮箱是否合法/([\w\-]+@[\w\-]+\.[\w\-+]+)/
if(!preg_match("/([\w\-]+@[\w\-]+\.[\w\-+]+)/",$email)){
$emailErr="请输入正确的邮箱";
}
}
if(empty($_POST["web"])){
$webErr = "请填写网址";
}else{
//否则传入web值
$web = abc($_POST["web"]);
//正则表达式，检测URL地址是否合法/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i
if(!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$web)){
$webErr="请输入正确的网址";
}
}
if(empty($_POST["notes"])){
$notes="";
}else{
$notes=abc($_POST["notes"]);
}
if(empty($_POST["wm"])){
$wm="性别是必填选项";
}else{
$wm=abc($_POST["wm"]);
}
}
//构造函数
function abc($shine){
$shine=trim($shine);
$shine=stripslashes($shine);
$shine=htmlspecialchars($shine);
return $shine;
}
?>
<h1>表单验证</h1>
<p> <span class="adc">*代表必填选项</span> </p>
<form method="post" action="<?php echo htmlspecialchars($SERVER["PHP_SELF"])?>" >
名     字 ：<input type="text" name="name" value="<?php echo $name;?>"/>
<span class="adc">*<?php echo $nameErr;?></span>
<br>
E-mail   ：<input type="text" name="email" value="<?php echo $email;?>"/>
<span class="adc">*<?php echo $emailErr;?></span>
<br>
web地址：<input type="text" name="web" value="<?php echo $web;?>"/>
<span class="adc">*<?php echo $webErr;?></span>
<br>
备注：<br><textarea name="notes" cols="40" rows="5"><?php echo $notes;?></textarea><br>
性别:<br>
<input type="radio" name="wm" <?php if(isset($wm) && $wm=="woman") echo "checked" ?> value="woman">女
<br>
<input type="radio" name="wm" <?php if(isset($wm) && $wm=="man") echo "checked" ?> value="man">男
<span class="adc">*<?php echo $wmErr;?></span>
<br>
<input type="submit" name="submit" value="submit">
</form>
<?php
echo "<h1>你输入的内容是：</h1>";
echo $name;
echo "<br>";
echo $email;
echo "<br>";
echo $web;
echo "<br>";
echo $notes;
echo "<br>";
echo $wm;
?>
</body>
</html>简单的php的前后端交互，技术友可以用来练习.
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