Re: sort multidimension array

[weetat <weetat.yeo@xxxxxxxxx>]

Hi David ,

  Thanks for your input, it solve my problem.



David Tulloh wrote:
> Examine your function for the case of cmpcountry("Thailand", "");
> if($country2 == '') is true
>   if($country1 < $country2) is false
> Then ($country1 < $country2) is false again and 1 is returned.
> This means that "" is less than "Thailand", and should be sorted higher.
>
> The easiest way to fix this is actually to remove the inner ifs in both
> your if blocks, they are not necessary.  The second if block should also
> return -1.
>
>
> David
>
> weetat wrote:
> > Hi all,
> >
> >  I have multi-arrays as shown below:
> >  I implemented usort() to sort the array by 'country' field in the array.
> >  However there some empty string value in the array and i setup my
> > cmpcountry() function to sort array, however , some country empty string
> > value are sort first .
> >
> > Any ideas what happen in the cmpcountry() function ?
> >
> >  The result of sort array below is :
> >
> >    Singapore
> >    Singapore
> >    Thailand
> >    ''
> >    Thailand
> >    ''
> >    ''
> >    Malaysia
> >    Phillipines
> >
> >
> >  function cmpcountry($a, $b)
> >   {
> >
> >         $country1 = $a['country'];
> >         $country2 = $b['country'];
> >
> >         if($country1 == ''){
> >          if($country1 < $country2){
> >             return 1;
> >          }
> >         }
> >
> >         if($country2 == '') {
> >          if($country1 < $country2){
> >             return 1;
> >          }
> >         }
> >
> >         return ($country1 < $country2) ? -1 : 1;
> >   }
> >
> > usort($arraytest,"cmpcountry");
> >
> >  $arraytest= array(
> >      array
> >         (
> >             'country' => 'Thailand',
> >             'city' => 'Z'
> >         )
> >      ,
> >      array
> >         (
> >             'country' => 'Thailand',
> >             'city' => 'M'
> >         )
> >      ,
> >      array
> >         (
> >             'country' => 'Singapore',
> >             'city' => 'G'
> >         )
> >      ,
> >      array
> >         (
> >             'country' => 'Singapore',
> >             'city' => 'B'
> >         )
> >      ,
> >      array
> >         (
> >             'country' => '',
> >             'city' => 'U'
> >         )
> >       ,
> >       array
> >         (
> >             'country' => '',
> >             'city' => 'Y'
> >         )
> >     ,
> >     array
> >         (
> >             'country' => '',
> >             'city' => 'J'
> >         )
> >
> >      );

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