PHP循环控制,for，while遍历关联数组
一、PHP循环控制
数组指针
1、key():返回当前数组元素的键
2、current():返回当前数组元素的值
3、next():将指针指向数组元素当前元素的下一个元素的位置
4、reset():复位数组指针，指向第一个元素
5、prev():数组指针上移一个
6、end():数组指针移到最后一个元素
PHP循环控制 、for()、while()遍历数组
<?php/*php循环控制-遍历索引数组*/$arr1 = ['van', 'toan', 'anh', 'ly', 'hoa hoc'];//for()for($i = 0; $i < count($arr1); $i++ ) {echo $arr1[$i] .',';}echo '<hr>';//while()$i = 0;while ($i < count($arr1)) {echo $arr1[$i] .',';$i++;}echo '<hr>';//foreachforeach($arr1 as $value) {echo $value . '<br>';}echo '<hr>';/*for()、while()遍历关联数组*/$arr2 = ['quocgia' =>'vietnam', 'thudo' => 'hanoi', 'dantoc' => 'kinh', 'danso' => '100000000', 'trungtam' => 'haiphong'];//for()for($i = 0; $i < count($arr2); $i++){echo key($arr2) . '==>' . current($arr2) . '<br>';next($arr2);}echo '<hr>';//while()reset($arr2);while (current($arr2)) {echo key($arr2) . '+++>' . current($arr2) . '<br>';next($arr2);}echo '<hr>';//foreach()foreach ($arr2 as $key => $value) {echo "$key => $value <br>";}echo '<hr>';
二、表单验证
HTML代码：
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>表单验证</title><style>.register > form{width: 400px;height: 300px;background-color: #19c0e7;border-radius: 10px; /*圆角*/text-align: center;margin: auto;}.register > form > div {display: grid;grid-template-columns: 100px 200px;margin: 20px 0;grid-column-gap:10px;}.register > form > div > label{text-align: right;}.register > form > div > input{border-radius: 5px;}</style></head><body><div class="register"><form action="action.php" method="post"><h3>用户注册</h3><div><label for="username">用户名</label><input type="text" name="username" id="username" placeholder="不超过20个字符" required autofocus></div><div><label for="password1">密码</label><input type="password" name="password1" id="password1" placeholder="不能为空" required></div><div><label for="password2">重复密码</label><input type="password" name="password2" id="password2" placeholder="再次输入的密码必须一致。" required></div><div><label for="email">邮箱</label><input type="email" name="email" id="email" placeholder="不能为空" required></div><span><button>提交</button></span></form></div></body></html>
HTML效果
PHP代码：
<?phpif ($_SERVER['REQUEST_METHOD'] === 'POST') { /*判断请求类型*/// echo 'YES';//empty():判断一个变量是否为“空”,当一个变量值为0，empty() 认为这个变量同等于空，即相当于没有设置。if(!empty($_POST['username'])) $username = $_POST['username'];if(!empty($_POST['password1'])) $password1 = $_POST['password1'];if(!empty($_POST['password2'])) $password2 = $_POST['password2'];if(!empty($_POST['email'])) $email = $_POST['email'];if ($password1 === $password2) {$password = md5(sha1($password1));}else{exit('<script>alert("两次密码不一致。"); history.back();</script>');}//compact（）：将得到的变量压缩到一个数组$data = compact('username', 'password', 'email');if((print($data)) === 1){exit('<script>alert("注册成功，请登录。"); history.back();</script>');}else{exit('<script>alert("注册失败，请登重试。"); history.back();</script>');}}else{exit('<h3 style="color: red">请求类型错误！</h3>');}
效果
手抄作业
