数组处理技巧

SELECT后的结构
array (size=4)
  0 => 
    array (size=1)
      'id' => int 32
  1 => 
    array (size=1)
      'id' => int 31
  2 => 
    array (size=1)
      'id' => int 30
  3 => 
    array (size=1)
      'id' => int 27

单个的话

array (size=1)
  0 => 
    array (size=1)
      'id' => int 27

FIND后的结构

array (size=2)
  'id' => int 27
  'name' => string '上海万达五角场分店' (length=27)

对SELECT集合处理的处理方式

  foreach ($res1 as $k => $v) {
                $res[]=['id'=>$v['id']];
            }
            var_dump( $res);

array (size=4)
  0 => 
    array (size=1)
      'id' => int 32
  1 => 
    array (size=1)
      'id' => int 31
  2 => 
    array (size=1)
      'id' => int 30
  3 => 
    array (size=1)
      'id' => int 27
  foreach ($res1 as $k => $v) {

            $res[]=[$v];

            }
            var_dump( $res);

array (size=4)
  0 => 
    array (size=1)
      0 => int 32
  1 => 
    array (size=1)
      0 => int 31
  2 => 
    array (size=1)
      0 => int 30
  3 => 
    array (size=1)
      0 => int 27

    foreach ($res1 as $k => $v) {

                array_push( $res,$v['id']);
            }
            var_dump( $res);

array (size=4)
  0 => int 32
  1 => int 31
  2 => int 30
  3 => int 27


$cus=array_column($res1,'id');
var_dump($cus);
array (size=4)
  0 => int 32
  1 => int 31
  2 => int 30
  3 => int 27
注意对SELECT结果有效即使一行,对FIND的结果集无效
array (size=1)
 0 =>    
 array (size=1)
  'id' => int 27
区别FIND
array (size=1)
  'id' => int 27

    foreach ($res1 as $k => $v) {

                array_push( $res,$v);
            }
            var_dump( $res);

  0 => 
    array (size=1)
      'id' => int 32
  1 => 
    array (size=1)
      'id' => int 31
  2 => 
    array (size=1)
      'id' => int 30
  3 => 
    array (size=1)
      'id' => int 27

  0 => int 32
  1 => int 31
  2 => int 30
  3 => int 27