php 二维数组排序与遍历

function multi_array_sort($multi_array,$sort_key,$sort=sort_asc){  
    if(is_array($multi_array)){  
        foreach ($multi_array as $row_array){  
            if(is_array($row_array)){  
                $key_array[] = $row_array[$sort_key];  
            }else{  
                return -1;  
            }  
        }  
    }else{  
        return -1;  
    }  
    array_multisort($key_array,$sort,$multi_array);  
    return $multi_array;  
} 

bool array_multisort ( array $ar1 [, mixed $arg [, mixed $... [, array $... ]]] )

//以时间inputdate为key值进行二维数组降序排列
function array_sort($arr,$keys,$type){
$keysvalue=array();
$i = 0;
foreach($arr as $key=>$val) {
$val[$keys] = str_replace("-","",$val[$keys]);
$val[$keys] = str_replace(" ","",$val[$keys]);
$val[$keys] = str_replace(":","",$val[$keys]);
$keysvalue[] =$val[$keys];

}
asort($keysvalue); //key值排序
reset($keysvalue); //指针重新指向数组第一个
foreach($keysvalue as $key=>$vals) {
$keysort[] = $key;
}
$new_array = array();
if($type != "asc"){
for($ii=count($keysort)-1; $ii>=0; $ii--) {
$new_array[] = $arr[$keysort[$ii]];
}
}else{
for($ii=0; $ii $new_array[] = $arr[$keysort[$ii]];
}
}
return $new_array;
}
?>

    $a = array(
       0=>array("id"=>1,"name"=>"小何","addr"=>"0:1"),
       1=>array("id"=>2,"name"=>"小刚","addr"=>"0:1:2"),
       2=>array("id"=>3,"name"=>"小军","addr"=>"0:1:3"),
       3=>array("id"=>4,"name"=>"公司","addr"=>"0:4"),
    );
function sort_by($array, $keyname = null, $sortby){
    $myarray = $inarray = array();
    foreach($array as $i=>$befree){
      $myarray[$i] = $array[$i][$keyname];
    }
    switch($sortby){
       case 'asc':
       asort($myarray);
       break;
       case 'arsort':
       arsort($myarray);
       break;
       case 'natcasesor':
       natcasesor($myarray);
       break;
    }
    foreach($myarray as $key=>$befree){
        $inarray[$key] = $array[$key];
        }
          return $inarray;
}
print_r(sort_by($a,"addr","arsort"));

print_r($a[2]["id"]);
?>