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循环遍历数组及登陆表单验证--PHP培训第十期线上班
宋明杰
Original
657 people have browsed it

1,for循环遍历关联数组,

  1. $chenjidan = ['xuehao' => '9号','xingming' => '张三','chengji' => '100分'];
  2. //将数组的指针复位,
  3. reset($chenjidan);
  4. //循环3条件,1,循环变量初始化,2,循环条件判断,3循环变量的改变。
  5. for($i = 0; $i < count($chenjidan); $i++){
  6. $k = key($chenjidan); //用一个变量接收下标值,
  7. $v = current($chenjidan);//用一个变量接收元素值。
  8. echo "$k => $v,<br>";
  9. next($chenjidan);//
  10. }

实例运行:

2,white循环关联数组:

  1. //将数组的指针复位,
  2. reset($chenjidan);
  3. $i = 0;
  4. while ($i < count($chenjidan)) {
  5. $k = key($chenjidan); //用一个变量接收下标值,
  6. $v = current($chenjidan);//用一个变量接收元素值。
  7. echo "$k => $v,<br>";
  8. // echo key($chenjidan) . '=>' . current($chenjidan) . '<br>'; //不通过变量,直接输出。
  9. next($chenjidan);//
  10. $i++;
  11. }
  12. ?>

运行实例:

3,数组指针

下标 0 1 2 3
9号 张三 语文 98分

下面的函数可以针对数组进行相应的操作:

  1. current() //取得数组当前指针所在单元的值;
  2. key() //取得数组当前指针所在单元的下标;
  3. reset() //将数组指针移到最前面的位置,并取得新位置上的值;
  4. next() //将数组指针移到下一个位置,并取得新位置上的值;
  5. prev() //将数组指针移到上一个位置,并取得新位置上的值;
  6. end() //将数组指针移到最后面的位置,并取得新位置上的值;

4,登陆表单:

HTML代码:

  1. <div class="zc">
  2. <h3>用户注册</h3>
  3. <form action="xuexi2.php" method="post" class="zc1">
  4. <span>
  5. <label for="yonghuming">用户名:</label>
  6. <input type="text" name="yonghuming" id="yonghuming" placeholder="用户名为数字和英文字母">
  7. </span>
  8. <span>
  9. <label for="mima">密码:</label>
  10. <input type="text" name="mima" id="mima" placeholder="请输入密码">
  11. </span>
  12. <span>
  13. <label for="chongfumima">重复密码:</label>
  14. <input type="text" name="chongfumima" id="chongfumima" placeholder="重复输入密码">
  15. </span>
  16. <span class="zc1a">
  17. <label for="male">性别:</label>
  18. <span class="zc2">
  19. <input type="radio" name="gender" id="male" value="male" required><label for="male"></label>
  20. <input type="radio" name="gender" id="female" value="female" required><label for="female"></label>
  21. </span>
  22. </span>
  23. <span>
  24. <label for="lianxiren">联系人:</label>
  25. <input type="text" name="lianxiren" id="lianxiren" placeholder="请输入正确的姓名">
  26. </span>
  27. <span>
  28. <label for="tel">电话号码:</label>
  29. <input type="text" name="tel" id="tel" placeholder="请输入正确的电话号码">
  30. </span>
  31. <button>提交</button>
  32. </form>
  33. </div>

运行实例:

PHP后台验证代码:

  1. <?php
  2. //读取表单所有提交的值
  3. echo '<pre>' . print_r($_POST, true) . '</pre>>';
  4. //读取表单提交的单一项值
  5. echo '用户名:' . $_POST['yonghuming'] . '<br>';
  6. //判断请求类型
  7. echo '请求类型:' . $_SERVER['REQUEST_METHOD'] . '<br>';
  8. //判断请求的值是否和提交的值一样:
  9. if($_SERVER['REQUEST_METHOD'] === 'POST'){
  10. //empty():空字符串,0.null,false,
  11. //判断值是否为空,并用一个变量取出相应提交的值:
  12. if(!empty($_POST['yonghuming'])) $yonghuming = $_POST['yonghuming'];
  13. if(!empty($_POST['mima'])) $mima = $_POST['mima'];
  14. if(!empty($_POST['chongfumima'])) $chongfumima = $_POST['chongfumima'];
  15. if(!empty($_POST['gender'])) $gender = $_POST['gender'];
  16. if(!empty($_POST['lianxiren'])) $lianxiren = $_POST['lianxiren'];
  17. if(!empty($_POST['tel'])) $tel = $_POST['tel'];
  18. if ($mima === $chongfumima) {
  19. // md5():32位随机字符串, sha1():40位随机字符串
  20. $mima = md5(sha1($chongfumima));
  21. } else {
  22. exit('<script>alert("二次密码不一致");history.back();</script>');
  23. }
  24. //将上面变量组装成数组(compact)
  25. $zhuce = compact('yonghuming','mima','gender','lianxiren','tel');
  26. echo '<pre>' . print_r($zhuce, true) . '</pre>>';
  27. }
  28. else{
  29. echo ('<b style="color: red">类型错误</b>');

运行实例:

手写代码:

总结:

1,一步慢,步步慢,等抓紧时间追赶上进度。
2,对遍历数组要多熟悉
3,对函数要多熟悉,争取牢记于心。

Correcting teacher:天蓬老师天蓬老师

Correction status:qualified

Teacher's comments:其实程序员也其它工作是一样的, 就是一个熟练的过程, 对不对? 不过, 思维方式也很重要, 所以, 程序员老了不会老年痴呆的, 想变傻都难
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