[英]How to get max and min value in a multidimensional array
我有這個數組:
array(8) {
[0]=>
array(2) {
["ticket_type"]=>
string(9) "normal"
["ticket_price"]=>
string(5) "82.00"
}
[1]=>
array(2) {
["ticket_type"]=>
string(9) "cheaper"
["ticket_price"]=>
string(5) "62.00"
}
[2]=>
array(2) {
["ticket_type"]=>
string(9) "normal"
["ticket_price"]=>
string(6) "182.00"
}
[3]=>
array(2) {
["ticket_type"]=>
string(9) "cheaper"
["ticket_price"]=>
string(6) "162.00"
}
[4]=>
array(2) {
["ticket_type"]=>
string(9) "normal"
["ticket_price"]=>
string(6) "103.00"
}
[5]=>
array(2) {
["ticket_type"]=>
string(9) "cheaper"
["ticket_price"]=>
string(5) "63.00"
}
[6]=>
array(2) {
["ticket_type"]=>
string(9) "normal"
["ticket_price"]=>
string(6) "203.00"
}
[7]=>
array(2) {
["ticket_type"]=>
string(9) "cheaper"
["ticket_price"]=>
string(6) "163.00"
}
}
我想獲取“普通”和“便宜”機票類別的最低和最高價格,會有更多的機票類別,所以不能對其進行硬編碼,可以從DB獲取,我該怎么做? 我現在正在使用PHP 5.6,需要導出為數組或json,讓我知道是否需要更多詳細信息。
謝謝
您可以在SQL級別上執行此操作:
SELECT MIN(ticket_price) AS min_ticket_price, MAX(ticket_price) as max_ticket_price, ticket_type
FROM {your_table_name}
WHERE {your_conditions}
GROUP BY ticket_type
如果您仍然想在PHP中執行此操作,則可以循環數組並對票證類型進行排序,然后獲取最小值和最大值。
foreach($arr as $ticket){
$new[$ticket["ticket_type"]][] = $ticket["ticket_price"];
}
// loop the new array to only get the max and min values of each ticket type
foreach($new as $key => $n){
$res[$key]["max"] = max($n);
$res[$key]["min"] = min($n);
}
輸出:
array(2) {
["normal"]=>
array(2) {
["max"]=>
string(6) "203.00"
["min"]=>
string(5) "82.00"
}
["cheaper"]=>
array(2) {
["max"]=>
string(6) "163.00"
["min"]=>
string(5) "62.00"
}
}
這是在php級別上要執行的解決方案:
$prices = [
["ticket_type"=>"normal", "ticket_price"=>"82.00"],
["ticket_type"=>"cheaper", "ticket_price"=>"62.00"],
["ticket_type"=>"normal", "ticket_price"=>"182.00"],
["ticket_type"=>"cheaper", "ticket_price"=>"162.00"],
["ticket_type"=>"normal", "ticket_price"=>"103.00"],
["ticket_type"=>"cheaper", "ticket_price"=>"63.00"],
["ticket_type"=>"normal", "ticket_price"=>"203.00"],
["ticket_type"=>"cheaper", "ticket_price"=>"163.00"],
];
// STEP:1 group by ticket types
$grouped_array = [];
foreach($prices as $price) {
$ticket_type = $price["ticket_type"];
$grouped_array[$ticket_type][] = $price["ticket_price"];
}
/*
$grouped_array = [
"normal" => ["82.00", "182.00", "103.00", "203.00"],
"cheaper => ["62.00", "162.00", "63.00", "163.00"]
];
*/
function minMax($type_array) {
$min_max = ['min'=> min($type_array), 'max'=>max($type_array)];
return $min_max;
}
// STEP 2: find min and max in each category
$min_max = [];
foreach($grouped_array as $type => $prices) {
$min_max[$type] = minMax($prices);
}
/*
$min_max = [
"normal" => ["min"=>"82.00", "max"=>"203.00"],
"cheaper => ["min"=>"62.00", "max"=>"163.00"]
];
*/
但是,在您的情況下,最好在數據庫層上執行此操作。 這回答了“如何在多維數組中獲得最大值和最小值”。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.