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          php5.5新數組函數array_column

          來源:互聯網 作者:秩名 發表于:2013-07-13 13:17  點擊:
          PHP5.5發布了,其中增加了一個新的數組函數array_column,感覺不錯的!但是低版本PHP要使用,得自己實現: 參考地址:https://wiki.php.net/rfc/array_column if(!function_exists(array_column)){ function array_column($input, $columnKey, $indexKey=null
          PHP5.5發布了,其中增加了一個新的數組函數array_column,感覺不錯的!但是低版本PHP要使用,得自己實現:
          參考地址:https://wiki.php.net/rfc/array_column



          if(!function_exists('array_column')){
              function array_column($input, $columnKey, $indexKey=null){
                  $columnKeyIsNumber      = (is_numeric($columnKey)) ? true : false;
                  $indexKeyIsNull         = (is_null($indexKey)) ? true : false;
                  $indexKeyIsNumber       = (is_numeric($indexKey)) ? true : false;
                  $result                 = array();
                  foreach((array)$input as $key=>$row){
                      if($columnKeyIsNumber){
                          $tmp            = array_slice($row, $columnKey, 1);
                          $tmp            = (is_array($tmp) && !empty($tmp)) ? current($tmp) : null;
                      }else{
                          $tmp            = isset($row[$columnKey]) ? $row[$columnKey] : null;
                      }
                      if(!$indexKeyIsNull){
                          if($indexKeyIsNumber){
                              $key        = array_slice($row, $indexKey, 1);
                              $key        = (is_array($key) && !empty($key)) ? current($key) : null;
                              $key        = is_null($key) ? 0 : $key;
                          }else{
                              $key        = isset($row[$indexKey]) ? $row[$indexKey] : 0;
                          }
                      }
                      $result[$key]       = $tmp;
                  }
                  return $result;
              }
          }

          // 使用例子
          $records = array(
              array(
                  'id' => 2135,
                  'first_name' => 'John',
                  'last_name' => 'Doe'
              ),
              array(
                  'id' => 3245,
                  'first_name' => 'Sally',
                  'last_name' => 'Smith'
              ),
              array(
                  'id' => 5342,
                  'first_name' => 'Jane',
                  'last_name' => 'Jones'
              ),
              array(
                  'id' => 5623,
                  'first_name' => 'Peter',
                  'last_name' => 'Doe'
              )
          );
          $firstNames = array_column($records, 'first_name');
          print_r($firstNames);
          /*
          Array
          (
              [0] => John
              [1] => Sally
              [2] => Jane
              [3] => Peter
          )
          */

          $records = array(
              array(1, 'John', 'Doe'),
              array(2, 'Sally', 'Smith'),
              array(3, 'Jane', 'Jones')
          );
          $lastNames = array_column($records, 2);
          print_r($lastNames);
          /*
          Array
          (
              [0] => Doe
              [1] => Smith
              [2] => Jones
          )
          */

          $mismatchedColumns = array(
              array(
                  'a' => 'foo',
                  'b' => 'bar',
                  'e' => 'baz'
              ),
              array(
                  'a' => 'qux',
                  'c' => 'quux',
                  'd' => 'corge'
              ),
              array(
                  'a' => 'grault',
                  'b' => 'garply',
                  'e' => 'waldo'
              ),
          );
          $foo = array_column($mismatchedColumns, 'a', 'b');
          print_r($foo);
          /*
          Array
          (
              [bar] => foo
              [0] => qux
              [garply] => grault
          )
          */

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