使用太空飞船运算符通过两个参数使用usort数组

时间:2019-03-03 11:55:23

标签: arrays sorting php-7 usort

在PHP≥7.0 (使用spaceship operator <=>)的情况下,是否有更紧凑的方式通过两个参数/字段对数组进行排序?

现在我要排序的技巧首先是第二个参数,然后是第一个参数:

// Sort by second parameter title
usort($products, function ($a, $b) {
    return $a['title'] <=> $b['title']; // string
});

// Sort by first parameter brand_order
usort($products, function ($a, $b) {
    return $a['brand_order'] <=> $b['brand_order']; // numeric
});

这给了我想要的结果;首先按品牌订购产品,然后按名称订购。

我只是想知道他们是否可以通过一次usort通话来实现。


这是我的问题代码片段。可以here测试该示例。

<?php
        
// Example array
$products = array();

$products[] = array("title" => "Title A",  
              "brand_name" => "Brand B",
              "brand_order" => 1);
$products[] = array("title" => "Title C",  
              "brand_name" => "Brand A",
              "brand_order" => 0);
$products[] = array("title" => "Title E",  
              "brand_name" => "Brand A",
              "brand_order" => 0);
$products[] = array("title" => "Title D",  
              "brand_name" => "Brand B",
              "brand_order" => 1);

// Sort by second parameter title
usort($products, function ($a, $b) {
    return $a['title'] <=> $b['title']; // string
});

// Sort by first parameter brand_order
usort($products, function ($a, $b) {
    return $a['brand_order'] <=> $b['brand_order']; // numeric
});

// Output
foreach( $products as $value ){
    echo $value['brand_name']." — ".$value['title']."\n";
}

?>

1 个答案:

答案 0 :(得分:1)

usort($products, function ($a, $b) {
    if ( $a['brand_order'] == $b["brand_order"] ) {  //brand_order are same
       return $a['title'] <=> $b['title']; //sort by title
    }
    return $a['brand_order'] <=> $b['brand_order']; //else sort by brand_order
});

Test here