PHP开发笔记：二维数组根据某一项来进行排序

比如说我们现在有一个二维数组：

$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) 
); 

目标是针对于这个二维数组的每一项，根据他们的age来进行排序，排序过程中我们会使用到PHP内置的array_multisort() 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; 
} 

我们来看一下实例的处理结果：

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 
) 
)