$arr['a']['studentname'] = "john";
$arr['b']['studentname'] = "stefen";
$arr['c']['studentname'] = "alex";
是否可以使用用户定义的函数进行排序：
usort( $arr )
uasort( $arr )
uksort( $arr )
所以根据我需要传递的值，数组应该被排序！预期输出：
如果当前值则
Array
(
[c] => Array
(
[studentname] => alex
)
[a] => Array
(
[studentname] => john
)
[b] => Array
(
[studentname] => stefen
)
)
如果当前值则
Array
(
[b] => Array
(
[studentname] => stefen
)
[a] => Array
(
[studentname] => john
)
[c] => Array
(
[studentname] => alex
)
)
提前致谢
如果我理解了这个问题，你可以使用一个简单的字符串比较回调：
$arr['a']['studentname'] = "john";
$arr['b']['studentname'] = "stefen";
$arr['c']['studentname'] = "alex";
// A-Z
uasort($arr, function($a, $b) {
return strcmp($a['studentname'], $b['studentname']);
});
print_r($arr);
// Z-A
uasort($arr, function($a, $b) {
return strcmp($b['studentname'], $a['studentname']);
});
print_r($arr);
试试这个：
对于 PHP 版本> 5.3：
$arr['a']['studentname'] = "john";
$arr['b']['studentname'] = "stefen";
$arr['c']['studentname'] = "alex";
uasort($arr, function($a, $b) {
return strcmp($a['studentname'], $b['studentname']);
});
对于 PHP 版本 <5.3：
$arr['a']['studentname'] = "john";
$arr['b']['studentname'] = "stefen";
$arr['c']['studentname'] = "alex";
function sort_by($a, $b) {
return strcmp($a['studentname'], $b['studentname']);
}
uasort($arr, 'sort_by');