將秒數轉換成時分秒
gmstrftime('%H:%M:%S', $time);
計算二維數組($arr)下標值相同(response_num)的數據和
array_sum(array_map(function ($val) {
return $val['response_num'];
}, $arr));
運算結果:2
array_column($arr,‘鍵名’)取出二維數組中指定列組成新數組
$a = array(
array(
'id' => 5698,
'first_name' => 'Bill',
'last_name' => 'Gates',
),
array(
'id' => 4767,
'first_name' => 'Steve',
'last_name' => 'Jobs',
),
array(
'id' => 3809,
'first_name' => 'Mark',
'last_name' => 'Zuckerberg',
)
);
$last_names = array_column($a, 'last_name');
print_r($last_names);
結果:
Array
(
[0] => Gates
[1] => Jobs
[2] => Zuckerberg
)