按照某个字段 正序或者倒序 排序
$a = [
['id'=>2,'name'=>'b'],
['id'=>1,'name'=>'a'],
['id'=>3,'name'=>'c'],
];
按照id 从小到大排序
$ids = array_column($a,'id'); //[2,1,3]
array_multisort($ids,SORT_ASC,SORT_NUMERIC,$a);
print_r($a);
/*Array (
[0] => Array ( [id] => 1 [name] => a )
[1] => Array ( [id] => 2 [name] => b )
[2] => Array ( [id] => 3 [name] => c )
)*/
按照name顺序 从大到小排序
$names = array_column($a,'name');//Array ( [0] => b [1] => a [2] => c )
array_multisort($names,SORT_DESC,SORT_STRING,$a);
print_r($a);
/*Array (
[0] => Array ( [id] => 3 [name] => c )
[1] => Array ( [id] => 2 [name] => b )
[2] => Array ( [id] => 1 [name] => a )
)*/
按照其他数组排序
$a = [
['id'=>2,'name'=>'b'],
['id'=>1,'name'=>'a'],
['id'=>3,'name'=>'c'],
];
$b = [3,1,2];
//根据每条记录的字段id，去$b中查找对应的键值，作为这一条记录的键值。
$newarr = [];
foreach ($a as $v) {
$k = array_search($v['id'],$b);
$newarr[$k] = $v;
}
ksort($newarr);
/*Array (
[0] => Array ( [id] => 3 [name] => c )
[1] => Array ( [id] => 1 [name] => a )
[2] => Array ( [id] => 2 [name] => b )
)*/
