NYCPHP Meetup

[Elijah Insua]

This task is made much easier with qa class btw

On Feb 25, 2009, at 12:13 AM, csnyder <chsnyder at gmail.com> wrote:

> On Tue, Feb 24, 2009 at 3:52 PM, charlie derr <cderr at simons- 
> rock.edu> wrote:
>> Ajai Khattri wrote:
>>>
>>> On Tue, 24 Feb 2009, csnyder wrote:
>>>
>>>> What are you fishing for? Write some code and try it.
>>>
>>>
>>> Nice.
>>
>>
>> I initially had a similar reaction when I saw this comment, but  
>> when I
>> really thought about it, that's the power of PHP (that it's  so  
>> easy to just
>> try stuff).
>
> Well, no, he's right. I was just being mean because I underestimated
> how mind-bending the problem is.
>
> You have to pass your new array by reference, but you also have to
> pass the current key you're working on so that it can be prepended to
> new keys as you traverse them.
>
> My code is similar to Dan's:
>
> <?php
>
> function flatten( $array, &$flatarray, $currentkey ) {
>  foreach( $array AS $key=>$val ) {
>    $nextkey = $currentkey.'_'.$key;
>    if ( is_array( $val ) ) {
>      flatten( $val, $flatarray, $nextkey );
>    }
>    else {
>      $flatarray[ $nextkey ] = $val;
>    }
>  }
> }
>
> $array = array( 'a'=>array('b'=>'bee', 'c'=>'cee' ), 'b'=>array(
> 'd'=>'dee', 'e'=>'eee', 'f'=>array('g'=>'gee', 'h'=>'hee' ) ) );
> $flat = array();
>
> foreach ( $array AS $key=>$val ) {
>  if ( is_array( $val )) {
>    flatten( $val, $flat, $key );
>  }
>  else {
>    $flat[ $key ] = $val;
>  }
> }
>
> That took all of ten minutes to write and test, but there was
> definitely an "oh shi... " moment figuring out how to get the keys
> right.
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