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Calculate the sum of an element in a two-dimensional array in php
- 不言Original
- 2018-04-08 09:38:042797browse
The content of this article is to calculate the sum of a certain element in a two-dimensional array in PHP. Now I will share it with you. Friends in need can refer to it
<meta charset="utf-8">
<?php
$ar = array(
2 => array(
'catid' => '6',
'cat' => 'dd',
'catdir' => '1522332388000',//2018-03-29 22:06:28
),
6=> array(
'catid' => '5',
'cat' => 'dd',
'catdir' => '1522329351000'//2018-03-29 21:15:51
),
7=> array(
'catid' => '4',
'cat' => 'ddfgd',
'catdir' => '1522328237000'//2018-03-29 20:56:15
),
9=> array(
'catid' => '3',
'cat' => 'dd',
'catdir' => '1522327772000'//2018-03-29 20:49:32
),
10=> array(
'catid' => '2',
'cat' => 'dvvd',
'catdir' => '1522325351000'//2018-03-29 20:09:11
),
5 => array(
'catid' => '1',
'cat' => 'ddfgd',
'catdir' => '1522323606000',//2018-03-29 19:40:06
),
);
echo array_sum(array_map(create_function('$val', 'return $val["catid"];'), $ar));
?> Original example:
[0] => array(5) {
["id"] => string(2) "11"
["name"] => string(5) "1.jpg"
["suffix"] => string(3) "jpg"
["url"] => string(29) "./Uploads/1/5292f55d208e8.jpg"
["size"] => string(6) "715895"
}
[1] => array(5) {
["id"] => string(2) "12"
["name"] => string(22) "minisite数据库.docx"
["suffix"] => string(4) "docx"
["url"] => string(30) "./Uploads/1/5292f5606a52c.docx"
["size"] => string(5) "16667"
}
I want to calculate the sum of sizes
(1)
echo array_sum(array_map(create_function('$val', 'return $val["size"];'), $arr));
or
echo array_sum(array_map(function($val){return $val ['size'];}, $arr));
（2）
$sum = 0;
foreach($arr as $item){
$sum += (int) $item['size'];
}
Quote: https://www.cnblogs.com/isykw/p/6217097.html
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How to convert PHP two-dimensional array into one-dimensional array
How to remove duplicates from PHP two-dimensional array
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