PHP 多维数组的排序问题 根据二维数组中某个项排序

PHP内置函数 array_multisort 要求每个数组大小一样
$areas是地区的二维数组，包含人数和次数，现在要按这2种数进行降序排序

foreach($areaArray as &$areas) { 
$times = $numbers = array(); 
foreach($areas as $province => $v) { 
$times[$province] = $v['times']; 
$numbers[$province] = $v['numbers']; 
} 
array_multisort($times, SORT_DESC, $numbers, SORT_DESC, $areas); 
}

比如有个多为数组：

$arr = array( 
‘d' => array(‘id' => 5, ‘name' => 1, ‘age' => 7), 
‘b' => array(‘id' => 2,'name' => 3,'age' => 4), 
‘a' => array(‘id' => 8,'name' => 10,'age' => 5), 
‘c' => array(‘id' => 1,'name' => 2,'age' => 2) 
);

需要对二维数组中的 age 项排序。
需要用到PHP的内置函数 array_multisort（），可以看手册。
自定义函数：

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 false; 
} 
} 
}else{ 
return false; 
} 
array_multisort($key_array,$sort,$multi_array); 
return $multi_array; 
} 
//处理 
echo “<pre/>”; 
print_r(multi_array_sort($arr,'age'));exit; 
//输出 
Array 
( 
[c] => Array 
( 
[id] => 1 
[name] => 2 
[age] => 2 
) 
[b] => Array 
( 
[id] => 2 
[name] => 3 
[age] => 4 
) 
[a] => Array 
( 
[id] => 8 
[name] => 10 
[age] => 5 
) 
[d] => Array 
( 
[id] => 5 
[name] => 1 
[age] => 7 
) 
) 
written by 大宇 
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