PHP 如何以最高的效率将二维数组转为一位数组 - V2EX
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jingwentian
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PHP 如何以最高的效率将二维数组转为一位数组

  •   
  •   jingwentian May 25, 2014 6803 views
    This topic created in 4372 days ago, the information mentioned may be changed or developed.
    如题：

    https://gist.github.com/JingwenTian/4a6270aae3f1169b5002

    ---------------------------------------------
    //一个很大的二维数组
    $arr = array(
    0 => array(
    'id'=>11,
    'name'=>'name1'
    ),
    1 => array(
    'id'=>22,
    'name'=>'name2'
    ),
    2 => array(
    'id'=>33,
    'name'=>'name3'
    )

    );

    //如何以最高的效率实现将上面的二维数组转为一位数组
    array(
    0 => 11,
    1 => 22,
    2 => 33
    )
    ---------------------------------------------

    谢谢
  • 数组
  • 转为
  • 效率
    10 replies    2014-07-02 09:30:29 +08:00
    ferock
        1
    ferock  
    PRO
       May 25, 2014   2
    首先，php 没有n维数组这个概念，显然你是从asp 或者vb 转来的。包括c# 都没有n 维数组的概念
    其次，一次循环就可以解决你的问题

    $array=array();
    foreach($arr as $v){
    $array[]=$v['id'];
    }

    print_r($array); # 你可以看看这是不是你要的。

    另外，这个帖子里有人愿意回答一下v2ex 里怎么贴代码和使代码高亮么？
    h2ero
       
    h2ero  
       May 25, 2014   2
    array_column
    http://cn2.php.net/manual/en/function.array-column.php
    Garwih
        3
    Garwih  
       May 25, 2014 via Android
    @ferock /t/1244
    jingwentian
        4
    jingwentian  
    OP
       May 25, 2014
    @ferock
    记得以前直接可以贴gist地址就可以了，现在不好使了不晓得为什么
    jingwentian
        5
    jingwentian  
    OP
       May 25, 2014
    @ferock
    @h2ero 已感谢。
    我就是想不用foreach怎么能取出来的，@h2ero 的方法正是我想找的，php的原生函数都快忘干净了，惭愧
    lizheming
        6
    lizheming  
       May 25, 2014
    @ferock 没有多纬数组的概念？那官方手册上的 multidimensional array 做何解释？
    http://cn2.php.net/manual/en/language.types.array.php
    ferock
        7
    ferock  
    PRO
       May 25, 2014 via iPhone
    @lizheming 你从这个角度来说也是对的，但就像第一句说的，本质就是一个k-v 对象。v 本身也可以是一个object，所以大家理解角度不一样
    ferock
        8
    ferock  
    PRO
       May 25, 2014 via iPhone
    @h2ero 赞
    imn1
        9
    imn1  
       May 26, 2014
    array_column 是新函数，不能说忘了，应该说新认识才对
    我以前还专门写了个class对付矩阵数组的各种转换
    nevernet
        10
    nevernet  
       Jul 2, 2014
    ```
    $array=array();
    foreach($arr as $v){
    $array[]=$v['id'];
    }

    print_r($array); # 你可以看看这是不是你要的。
    ```
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