Is there a more compact way to sort an array by two parameters/fields with PHP ≥7.0 (using the spaceship operator <=>) ?
Right now I just to the trick to sort is first by the second parameter and then by the first:
// 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
});
This gives me the result I want; the products a first ordered by brand and then by their title.
I just wonder if there is a way to do it one usort call.
Here is my question as code snippet. This example can be tested here.
<pre><?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";
}
?></pre>Similar question but not specific about php7 and the spaceship operator have been answered here:
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
});