php三维数组变二维数组

<?php
    $result = Array(0 => Array(0 => Array(bid => 41,brealname => 'we教官',cid => 41,crealname => 'we教官')),
                    1 => Array(0 => Array(bid => 6,brealname => '虎子',cid => 19,crealname => '张鱼'))
    );

    //原数组
    print_r($result);
    echo "<br />";

    //第一种方法：
    foreach ($result as $key =>$v){
        $new_arr[]=$v[0];
    }
    echo '<pre>';
    print_r($new_arr);

    //第二种方法
    //初始化$arr2
    $arr2=array();  

    //循环遍历三维数组$arr3
    foreach($result as $value){
        foreach($value as $v){
             $arr2[]=$v;
        }
    }

    //销毁$arr3
    unset($result,$value,$v);
    echo "<br /s>";
    echo "第二种方法：";
    echo '<pre>';
    print_r($arr2);
?>