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php custom array function array_column

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Release： 2016-07-25 08:54:33
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  2. if(!function_exists('array_column')){
  3. function array_column($input, $columnKey, $indexKey=null){
  4. $columnKeyIsNumber = (is_numeric($columnKey)) ? true : false;
  5. $indexKeyIsNull = (is_null($indexKey)) ? true : false;
  6. $indexKeyIsNumber = (is_numeric($indexKey)) ? true : false;
  7. $result = array();
  8. foreach((array)$input as $key=>$row){
  9. if($columnKeyIsNumber){
  10. $tmp = array_slice($row, $columnKey, 1);
  11. $tmp = (is_array($tmp) && !empty($tmp)) ? current($tmp) : null;
  12. }else{
  13. $tmp = isset($row[$columnKey]) ? $row[$columnKey] : null;
  14. }
  15. if(!$indexKeyIsNull){
  16. if($indexKeyIsNumber){
  17. $key = array_slice($row, $indexKey, 1);
  18. $key = (is_array($key) && !empty($key)) ? current($key) : null;
  19. $key = is_null($key) ? 0 : $key;
  20. }else{
  21. $key = isset($row[$indexKey]) ? $row[$indexKey] : 0;
  22. }
  23. } // bbs.it-home.org
  24. $result[$key] = $tmp;
  25. }
  26. return $result;
  27. }
  28. }
  30. // 使用例子
  31. $records = array(
  32. array(
  33. 'id' => 2135,
  34. 'first_name' => 'John',
  35. 'last_name' => 'Doe'
  36. ),
  37. array(
  38. 'id' => 3245,
  39. 'first_name' => 'Sally',
  40. 'last_name' => 'Smith'
  41. ),
  42. array(
  43. 'id' => 5342,
  44. 'first_name' => 'Jane',
  45. 'last_name' => 'Jones'
  46. ),
  47. array(
  48. 'id' => 5623,
  49. 'first_name' => 'Peter',
  50. 'last_name' => 'Doe'
  51. )
  52. );
  53. $firstNames = array_column($records, 'first_name');
  54. print_r($firstNames);
  55. /*
  56. Array
  57. (
  58. [0] => John
  59. [1] => Sally
  60. [2] => Jane
  61. [3] => Peter
  62. )
  63. */
  65. $records = array(
  66. array(1, 'John', 'Doe'),
  67. array(2, 'Sally', 'Smith'),
  68. array(3, 'Jane', 'Jones')
  69. );
  70. $lastNames = array_column($records, 2);
  71. print_r($lastNames);
  72. /*
  73. Array
  74. (
  75. [0] => Doe
  76. [1] => Smith
  77. [2] => Jones
  78. )
  79. */
  81. $mismatchedColumns = array(
  82. array(
  83. 'a' => 'foo',
  84. 'b' => 'bar',
  85. 'e' => 'baz'
  86. ),
  87. array(
  88. 'a' => 'qux',
  89. 'c' => 'quux',
  90. 'd' => 'corge'
  91. ),
  92. array(
  93. 'a' => 'grault',
  94. 'b' => 'garply',
  95. 'e' => 'waldo'
  96. ),
  97. );
  98. $foo = array_column($mismatchedColumns, 'a', 'b');
  99. print_r($foo);
  100. /*
  101. Array
  102. (
  103. [bar] => foo
  104. [0] => qux
  105. [garply] => grault
  106. )
  107. */
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php自定义数组函数array_column
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