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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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