2020年3月12日

    1. php1
    2. <?php
    3. $num = 1;
    4. if($num == 1 ){
    5. echo "操作1:登录";
    6. }else if ($num == 2){
    7. echo "操作2:退出";
    8. }else if($num == 2){
    9. echo "操作3:注册";
    10. }else if($num == 2){
    11. echo "操作4:修改密码";
    12. }
    14. $num1= 10;
    15. $num2= 10;
    16. $fu = '*';
    18. switch($fu){
    19. case"+";
    20. echo "加法", $num1 + $num2;
    21. break;
    22. case"-";
    23. echo "减法", $num1 - $num2;
    24. break;
    25. case"*";
    26. echo "乘法", $num1 * $num2;
    27. break;
    28. case"/";
    29. echo "除法", $num1 / $num2;
    30. break;
    31. case"%";
    32. echo "取余", $num1 % $num2;
    33. break;
    34. }
    36. $username ="贼帅";
    37. $password ="12333";
    38. $status = 2; //1正常 2封号
    39. if($username == "贼帅"){
    40. if($password == "12333"){
    41. if($status ==1){
    42. echo "登录成功";
    43. }else if{ 
    44. echo "禁止登录，封号";
    45. }
    46. }else {
    47. echo "密码错误";
    48. }
    49. }else{
    50. echo "账号不存在";
    51. }
    54. php2
    55.  <?php
    56. $num = 1;
    57. if($num == 1 ){
    58. echo "操作1:登录";
    59. }else if ($num == 2){
    60. echo "操作2:退出";
    61. }else if($num == 2){
    62. echo "操作3:注册";
    63. }else if($num == 2){
    64. echo "操作4:修改密码";
    65. }
    67. $num1= 10;
    68. $num2= 10;
    69. $fu = '*';
    71. switch($fu){
    72. case"+";
    73. echo "加法", $num1 + $num2;
    74. break;
    75. case"-";
    76. echo "减法", $num1 - $num2;
    77. break;
    78. case"*";
    79. echo "乘法", $num1 * $num2;
    80. break;
    81. case"/";
    82. echo "除法", $num1 / $num2;
    83. break;
    84. case"%";
    85. echo "取余", $num1 % $num2;
    86. break;
    87. }
    89. $username ="贼帅";
    90. $password ="12333";
    91. $status = 2; //1正常 2封号
    92. if($username == "贼帅"){
    93. if($password == "12333"){
    94. if($status ==1){
    95. echo "登录成功";
    96. }else if{ 
    97. echo "禁止登录，封号";
    98. }
    99. }else {
    100. echo "密码错误";
    101. }
    102. }else{
    103. echo "账号不存在";
    104. }
    106. php3
    107. <?php
    108. $num = 1;
    109. if($num == 1 ){
    110. echo "操作1:登录";
    111. }else if ($num == 2){
    112. echo "操作2:退出";
    113. }else if($num == 2){
    114. echo "操作3:注册";
    115. }else if($num == 2){
    116. echo "操作4:修改密码";
    117. }
    119. $num1= 10;
    120. $num2= 10;
    121. $fu = '*';
    123. switch($fu){
    124. case"+";
    125. echo "加法", $num1 + $num2;
    126. break;
    127. case"-";
    128. echo "减法", $num1 - $num2;
    129. break;
    130. case"*";
    131. echo "乘法", $num1 * $num2;
    132. break;
    133. case"/";
    134. echo "除法", $num1 / $num2;
    135. break;
    136. case"%";
    137. echo "取余", $num1 % $num2;
    138. break;
    139. }
    141. $username ="贼帅";
    142. $password ="12333";
    143. $status = 2; //1正常 2封号
    144. if($username == "贼帅"){
    145. if($password == "12333"){
    146. if($status ==1){
    147. echo "登录成功";
    148. }else if{ 
    149. echo "禁止登录，封号";
    150. }
    151. }else {
    152. echo "密码错误";
    153. }
    154. }else{
    155. echo "账号不存在";
    156. }
    1. <!DOCTYPE html>
    2. <html lang="en">
    3. <head>
    4.     <meta charset="UTF-8">
    5.     <meta name="viewport" content="width=device-width,initial-scale=1.0">
    6.     <title>qianduan</title>
    7. </head>
    8. <body>
    9. <form accept="1.php" method="POST">
    10. <p>num:<input type="text" name="num"></p>
    11. <p>num2:<input type="text" name="num2"></p>
    12. <p>
    13.     <input type="radio" name="fu" value="+" checked>+
    14.     <input type="radio" name="fu" value="-" >-
    15.     <input type="radio" name="fu" value="*" >*
    16.     <input type="radio" name="fu" value="/" >/
    17.     <input type="radio" name="fu" value="%" >%
    18. </p>
    19. <p><input type="submit"></p>
    22. </form>
    24. </body>
    25. </html>
    1. <?php
    3. echo '<a href ="1.html">回到计算器</a><br>';
    4. echo"<pre>";
    5. var_dump($_POST);
    6. echo"</pre>";
    9. $num =$_POST['num'];
    10. $num2 =$_POST['num2'];
    11. $fu =$_POST['fu'];
    13. if(! $num){
    14.     exit("请将内容填写完整");
    15. }
    17. if(! $num2){
    18.     die("请将内容填写完整");
    19. }
    21. if(! is_numeric($num)){
    22.     exit("只能填写数字");
    23. }
    25. if(! is_numeric($num2)){
    26.     exit("只能填写数字");
    27. }
    29. switch($fu){
    30.     case'+':
    31.         echo'加法' , $num + $num2;
    32.     break;
    33.     case'-':
    34.         echo'减法' , $num - $num2;
    35.     break;
    36.     case'*':
    37.         echo'乘法' , $num * $num2;
    38.     break;
    39.     case'/':
    40.         echo'除法' , $num / $num2;
    41.     break;
    42.     case'%':
    43.         echo'取余' , $num % $num2;
    44.     break;
    46. }

    switch（原始值）{
    case 1（原配值）: // 原始值 == 匹配值，就执行冒号后的代码
    break；
    case 1（原配值）: // 原始值 == 匹配值，就执行冒号后的代码
    break；
    //case…
    default：
    #假区间
    }

    break；跳出（结束）流程控制代码；
    php：当case匹配的时候
    当case下的代码执行直到遇到switch代码体结束
    遇break；停下

    action 把数据提交到哪里去
    method 请求方式
    GET url里面传参数
    POST 做提交数据
    $_GET $_POST 系统超全局变量，内容为数组，必须大写
    取反：原来是有值则执行真区间的代码
    有值的情况下不需要做任何操作
    没值的情况下就把代码停止运行 （exit）

    判断数据必须为数字
    is_numeric()判断一个变量是否数字“1”0 1.0 如果数字则返回true

    作业 - 图1