使用php [duplicate]从数组中获取Min和Max

Question

This question already has an answer here:

• Sort multidimensional array by multiple keys 7 answers

I am facing an issue getting my desired value from an array, in PHP

Look at my array

 array(

  "0"=>array("id"=>"255","price"=>"2","discount"=>"1"),
  "1"=>array("id"=>"256","price"=>"2","discount"=>"3"),
  "2"=>array("id"=>"257","price"=>"2","discount"=>"4"),
  "3"=>array("id"=>"255","price"=>"3","discount"=>"5")

 );

I need Min Price and Max Discount, this time, I need array ID 2, that is

"2"=>array("id"=>"257","price"=>"2","discount"=>"4"),

Because in this array price is lower 2, and discount is 4, on next record you can see discount is much higher that is 5, but price is 3 which is higher then 2, so Desired result is sub array id 2

Kindly let me know How can i do this ?

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Answer 1

Please try to use this solution

$array = array(
    "0" => array("id" => "255", "price" => "2", "discount" => "1"),
    "1" => array("id" => "256", "price" => "2", "discount" => "2"),
    "2" => array("id" => "257", "price" => "2", "discount" => "4"),
    "3" => array("id" => "255", "price" => "3", "discount" => "5"),
);

$minPrice = min(array_column($array, 'price'));
$maxDiscountIndex = $maxDiscount = 0;

foreach ($array as $key => $value) {
    if ($value['price'] == $minPrice && $maxDiscount < (int) $value['discount']) {
        $maxDiscountIndex = $key;
        $maxDiscount = $value['discount'];
    }
}

echo $maxDiscountIndex; // 2

Algorithm description:

• Find the minimum price in all array
• Loop through all minimum price elements and find the maximum discount value