二维数组转为一维数组

1.很多时候会遇到二维数组，转为一维数组的时候会很苦恼，尤其是刚刚接触PHP的phper。

如下：将$arr转化为一维数组

$arr = Array (
               Array ( \'uuid\' => \'aaaaa\' ),
               Array ( \'uuid\' => \'bbbbb\' ),
               Array ( \'uuid\' => \'ccccc\' ),
               Array ( \'uuid\' => \'sssss\' ),
               Array ( \'uuid\' => \'ddddd\' ),
               Array ( \'uuid\' => \'eeeee\' ),
               Array ( \'uuid\' => \'fffff\' ),
               Array ( \'uuid\' => \'ggggg\' )
       );

两种方法：

1.foreach遍历

    $arr2 = array();
   foreach ($arr as $key => $value) {
       foreach ($value as $k => $v) {
           $arr2[$key]=$v;
       }
   }

　var_dump($arr2);

//array (size=8) 0 => string \'aaaaa\' (length=5) 1 => string \'bbbbb\' (length=5) 2 => string \'ccccc\' (length=5) 3 => string \'sssss\' (length=5) 4 => string \'ddddd\' (length=5) 5 => string \'eeeee\' (length=5) 6 => string \'fffff\' (length=5) 7 => string \'ggggg\' (length=5)

2.用array_column()函数

$arr2 = array_column($arr,\'uuid\');

var_dump($arr2);