PHP二维数组应用的问题。

<?php
$str = array(
"A" => array("water" => 39,"dian" => 110,"mei" => 130),
"B" => array("water" => 73,"dian" => 310,"mei" => 120),
"C" => array("water" => 21,"dian" => 107,"mei" => 110),
"D" => array("water" => 89,"dian" => 99,"mei" => 98));
foreach($str as $key=>$val){
$water[$key]=$val['water'];
$dian[$key]=$val['dian'];
$mei[$key]=$val['mei'];
}
$water_max=array_search(max($water),$water);
$water_min=array_search(min($water),$water);
$dian_max=array_search(max($dian),$dian);
$dian_min=array_search(min($dian),$dian);
$mei_max=array_search(max($mei),$mei);
$mei_min=array_search(min($mei),$mei);
echo "水费最高用户的是".$water_max."用了".max($water).";<br/>";
echo "水费最低用户的是".$water_min."用了".min($water).";<br/>";
echo "电费最高用户的是".$dian_max."用了".max($dian).";<br/>";
echo "电费最低用户的是".$dian_min."用了".min($dian).";<br/>";
echo "煤费最高用户的是".$mei_max."用了".max($mei).";<br/>";
echo "煤费最低用户的是".$mei_min."用了".min($mei).";<br/>";
?>
显示的结果是
水费最高用户的是D用了89;
水费最低用户的是C用了21;
电费最高用户的是B用了310;
电费最低用户的是D用了99;
煤费最高用户的是A用了130;
煤费最低用户的是D用了98;
ps:
数组的键名最好不要用中文，所以我都换成其他的了

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