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11月18日_php基础：函数与post传值 - 九期线上班
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一、post传值

  1. <?php
  2. //post请求
  3. //使用$_POST数组接收
  4. print_r($_POST);
  5. echo '<br>用户输入的邮箱：'.$_POST['email'];
  6. echo '<br>用户输入的密码：'.$_POST['password'];
  7. ?>
  8. <!DOCTYPE html>
  9. <html lang="en">
  10. <head>
  11.     <meta charset="UTF-8">
  12.     <title>POST传值</title>
  13. </head>
  14. <body>
  15.     <form action="" method="post">
  16.     <label for="email">email:</label>
  17.     <input type="text" name="email" id="email">
  18.     <label for="password">password:</label>
  19.     <input type="password" name="password" id="password">
  20.     <button>登陆</button>
  21.     </form>
  22. </body>
  23. </html>

二、php函数

  1. <?php
  2. //php系统函数
  3. //一、字符串函数
  4. //1.strtolower() 将字符串转换成小写
  5. $a = 'ABcDE';
  6. var_dump(strtolower($a));    //string(5) "abcde"
  7. echo '<br>';
  8. //2.strtoupper()将字符串转换成大写
  9. $string = 'abcdE';
  10. var_dump(strtoupper($string));    //string(5) "ABCDE"
  11. echo '<br>';
  12. //3.strlen() 获取字符串长度
  13. $string1 = 'afuiabceankjfdsa';
  14. var_dump(strlen($string1));        //int(16)
  15. echo '<br>';
  16. //4.trim() 去除字符串首尾空白字符（或其他字符）
  17. $string = "  123123  ";
  18. echo trim($string);    //123123
  19. echo '<br>';
  20. var_dump(trim($string));    //string(6) "123123"
  21. echo '<br>';
  22. //5.ltrim() 去除字符串左边的空白字符（或其他字符）
  23. $string = "1234321";
  24. var_dump(ltrim($string,'1'));    //string(6) "234321"
  25. echo '<br>';
  26. //6.rtrim() 去除字符串右边的空白字符（或其他字符）
  27. $string = "1234321";
  28. var_dump(rtrim($string,'1'));    //string(6) "123432"
  29. echo '<br>';
  30. //7.str_replace() 字符串替换
  31. $string = "123aaa123";
  32. var_dump(str_replace('aaa', '123', $string));    //string(9) "123123123"
  33. echo '<br>';
  34. //8.strpbrk() 字符串中查找一组字符是否存在...
  35. $string = '13701796255';
  36. var_dump(strpbrk($string, '18'));    //string(11) "13701796255"
  37. echo '<br>';
  38. //9.explode() 把字符串拆分成数组。
  39. $stringArr = 'a b c d e';
  40. var_dump(explode(' ', $stringArr));    //array(5) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" [3]=> string(1) "d" [4]=> string(1) "e" }
  41. echo '<br>';
  42. //10.implode() 把数组组合为字符串。
  43. $array = ['a','b','c','d','e'];
  44. var_dump(implode('', $array));    //string(5) "abcde"
  45. echo '<br>';
  46. //11.md5() 对字符串进行md5加密
  47. $password = '123456';
  48. var_dump(md5($password));    //string(32) "e10adc3949ba59abbe56e057f20f883e"
  49. echo '<br>';
  50. //12.count() 计算数组中元素的数量
  51. $arr = ['1','2','3','4','5'];
  52. var_dump(count($arr));        //int(5)
  53. echo '<br>';
  54. //13.array_merge() 合并两个数组
  55. $arr2 = ['a','b','c'];
  56. var_dump(array_merge($arr,$arr2));    //array(8) { [0]=> string(1) "1" [1]=> string(1) "2" [2]=> string(1) "3" [3]=> string(1) "4" [4]=> string(1) "5" [5]=> string(1) "a" [6]=> string(1) "b" [7]=> string(1) "c" }
  57. echo '<br>';
  58. //14.in_array() 查询数组中是否存在某值
  59. var_dump(in_array('a', $arr));    //bool(false)
  60. echo '<br>';
  61. var_dump(in_array('a', $arr2));    //bool(true)
  62. echo '<br>';
  63. //15.sort() 数组的升序排序 对索引数组 成功返回1 失败返回0
  64. $arr_sort = ['16','25','32','12.5'];
  65. sort($arr_sort);
  66. print_r($arr_sort);    //Array ( [0] => 12.5 [1] => 16 [2] => 25 [3] => 32 )
  67. echo '<br>';
  68. //16.rsort() 数组的降序排序
  69. rsort($arr_sort);
  70. print_r($arr_sort);    //Array ( [0] => 32 [1] => 25 [2] => 16 [3] => 12.5 )
  71. echo '<br>';
  72. //17.array_unique() 移除数组中重复的值 去除之后下标保持不变
  73. $array = ['6','6','6','5','4'];
  74. $array_unique=array_unique($array);
  75. print_r($array_unique);        //Array ( [0] => 6 [3] => 5 [4] => 4 )
  76. echo '<br>';
  77. //18.array_push()    将元素添加到数组的末尾 返回添加后的数组长度
  78. array_push($array,'3','2','1');
  79. print_r($array);    //Array ( [0] => 6 [1] => 6 [2] => 6 [3] => 5 [4] => 4 [5] => 3 [6] => 2 [7] => 1 )
  80. echo '<br>';
  81. //19.array_pop()    将数组末尾最后一个元素移除 返回被删除元素
  82. array_pop($array);
  83. print_r($array);    //Array ( [0] => 6 [1] => 6 [2] => 6 [3] => 5 [4] => 4 [5] => 3 [6] => 2 )
  84. echo '<br>';
  85. //20.array_shift() 删除数组开头的元素
  86. array_shift($array);
  87. print_r($array);
  88. echo '<br>';
  89. //21.array_unshift()    将元素添加到数组开头
  90. array_unshift($array, '0');
  91. print_r($array);    //Array ( [0] => 0 [1] => 6 [2] => 6 [3] => 5 [4] => 4 [5] => 3 [6] => 2 )

手写：

总结：php中函数有很大作用，需要能灵活运用处理解决问题。函数众多，记是记不完也记不住的，功能具体分为几大类，可以按照功能分类记住一些常用的以提高开发效率。

Correcting teacher：查无此人查无此人

Correction status：qualified

Teacher's comments：完成的不错，继续努力
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