<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"];'), $ar)); ?>
原例子：
[0] => array(5) { ["id"] => string(2) "11" ["name"] => string(5) "1.jpg" ["suffix"] => string(3) "jpg" ["url"] => string(29) "./uploads/1/5292f55d208e8.jpg" ["size"] => string(6) "715895" } [1] => array(5) { ["id"] => string(2) "12" ["name"] => string(22) "minisite数据库.docx" ["suffix"] => string(4) "docx" ["url"] => string(30) "./uploads/1/5292f5606a52c.docx" ["size"] => string(5) "16667" }
我要计算size的和
（1）
echo array_sum(array_map(create_function('$val', 'return $val[size];'), $arr));
或者
echo array_sum(array_map(function($val){return $val['size'];}, $arr));
（2）
$sum = 0;
foreach($arr as $item){
$sum += (int) $item['size'];
}
引用：https://www.cnblogs.com/isykw/p/6217097.html
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以上就是php中计算二维数组中某一元素之和 的详细内容。