[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數據庫.docx"
["suffix"] => string(4) "docx"
["url"] => string(30) "./Uploads/1/5292f5606a52c.docx"
["size"] => string(5) "16667"
}
我要計算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'
];
}