[英]php - sum of values in an array
我需要求和來對數組中的值求和。 該數組稱為$ results,我需要對每個月的Total_Sales值求和。 編輯-我有下面的循環,我需要得到結果; 但是我得到通知。 如何改進代碼,以免收到這些通知?
這是數組:
array(4) {
[0]=>
array(3) {
["Month"]=>
string(1) "1"
["Country"]=>
string(2) "AU"
["Total_Sales"]=>
string(7) "9095.70"
}
[1]=>
array(3) {
["Month"]=>
string(1) "1"
["Country"]=>
string(2) "CA"
["Total_Sales"]=>
string(9) "113993.00"
}
[2]=>
array(3) {
["Month"]=>
string(1) "2"
["Country"]=>
string(2) "AU"
["Total_Sales"]=>
string(7) "7393.65"
}
[4]=>
array(3) {
["Month"]=>
string(1) "2"
["Country"]=>
string(2) "CA"
["Total_Sales"]=>
string(9) "100279.43"
}
array(2) {
[1]=>
array(2) {
["MONTH"]=>
string(1) "1"
["Total_Sales"]=>
float(123088.7)
}
[2]=>
array(2) {
["MONTH"]=>
string(1) "2"
["Total_Sales"]=>
float(107673.08)
}
我知道我需要做一個循環,但不知道從這里去哪里。
$newarr=array();
foreach($results as $key) {
}
$newarr=array();
foreach($results as $value) {
$Month = $value['MONTH'];
$Total_Sales = $value['Total_Sales'];
array_key_exists( $Month, $newarr ) ? $newarr[$Month]['MONTH'] = $Month : $newarr[$Month]['MONTH'] = 0;
array_key_exists( $Month, $newarr ) ? $newarr[$Month]['Total_Sales']+=$Total_Sales : $newarr[$Month]['Total_Sales'] = 0;
}
注意:未定義的索引:第134行的/var/www/html/analytics/views/sales_year_line_data.php中的Total_Sales
注意:未定義的索引:第134行的/var/www/html/analytics/views/sales_year_line_data.php中的Total_Sales
在循環內,您只需添加以下值:
$newarr=array();
foreach($results as $val) {
// index your new array by month so you can easily add to total sales
$month = $val['Month'];
$newarr[$month]['Month'] = $month;
$newarr[$month]['Total_Sales'] += $val['Total_Sales'];
}
// to get rid of your month-based index, use array_values
$finalarray = array_values($newarr);
我收集的數組鍵是月份整數(如我所見,它從1開始)。
讓我們嘗試一下:
$totals = array();
foreach ($results as $result) {
$currentMonth = $result['Month'];
// For the first record for a given month, we need to add an "empty" record
if (!array_key_exists($currentMonth, $totals)) {
$totals[$currentMonth] = array(
'MONTH' => $currentMonth,
'Total_Sales' => 0,
);
}
// Then we can sum totals
$totals[$currentMonth]['Total_Sales'] += $result['Total_Sales'];
}
var_dump($results)
給我:
array (size=2)
1 =>
array (size=2)
'MONTH' => string '1' (length=1)
'Total_Sales' => float 123088.7
2 =>
array (size=2)
'MONTH' => string '2' (length=1)
'Total_Sales' => float 107673.08
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