[PHP] sort multidimension array

[weetat]

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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