我如何排序这个对象数组的一个字段,如名称或计数?
Array
(
[0] => stdClass Object
(
[ID] => 1
[name] => Mary Jane
[count] => 420
)
[1] => stdClass Object
(
[ID] => 2
[name] => Johnny
[count] => 234
)
[2] => stdClass Object
(
[ID] => 3
[name] => Kathy
[count] => 4354
)
....
你可以像这样使用我们
如果你想按数字排序:
function cmp($a, $b)
{
if ($a == $b) {
return 0;
}
return ($a < $b) ? -1 : 1;
}
$a = array(3, 2, 5, 6, 1);
usort($a, "cmp");
或Abc char:
function cmp($a, $b)
{
return strcmp($a["fruit"], $b["fruit"]);
}
$fruits[0]["fruit"] = "lemons";
$fruits[1]["fruit"] = "apples";
$fruits[2]["fruit"] = "grapes";
usort($fruits, "cmp");
查看更多信息:https://www.php.net/manual/en/function.usort.php
这里所有答案的缺点是它们使用静态字段名,所以我写了一个OOP风格的调整版本。假设您正在使用getter方法,您可以直接使用这个类并使用字段名作为参数。也许有人会觉得它有用。
class CustomSort{
public $field = '';
public function cmp($a, $b)
{
/**
* field for order is in a class variable $field
* using getter function with naming convention getVariable() we set first letter to uppercase
* we use variable variable names - $a->{'varName'} would directly access a field
*/
return strcmp($a->{'get'.ucfirst($this->field)}(), $b->{'get'.ucfirst($this->field)}());
}
public function sortObjectArrayByField($array, $field)
{
$this->field = $field;
usort($array, array("Your\Namespace\CustomSort", "cmp"));;
return $array;
}
}
如果你想对整数值进行排序:
// Desc sort
usort($array,function($first,$second){
return $first->number < $second->number;
});
// Asc sort
usort($array,function($first,$second){
return $first->number > $second->number;
});
更新
使用字符串时不要忘记转换为相同的寄存器(上寄存器或下寄存器)
// Desc sort
usort($array,function($first,$second){
return strtolower($first->text) < strtolower($second->text);
});
// Asc sort
usort($array,function($first,$second){
return strtolower($first->text) > strtolower($second->text);
});