拆分php数组[关闭]

Question

i am using $_POST for getting all input values and it generates an array like:

[seen1] => 1
[flag1] => 0
[time1] => 275
[qtsnums1] => 17
[seen2] => 0
[flag2] => 0
[time2] => 0
[qtsnums2] => 11
[seen3] => 0
[flag3] => 0
[time3] => 0
[qtsnums3] => 9
[seen4] => 0
[flag4] => 0
[time4] => 0
[qtsnums4] => 5
[seen5] => 0
[flag5] => 0
[time5] => 0
[qtsnums5] => 10

i want to split:

[seen1] => 1
[flag1] => 0
[time1] => 275
[qtsnums1] => 17

and insert in 1 variable, how to do this?

Answer 1

Assuming your input array is named $input, you can create your new array using this:

$output = array();
$wantedKeys = array('seen1', 'flag1', 'time1', 'qtsnums1');
foreach ($wantedKeys as $key)
{
    $output[$key] = $input[$key];
}
print_r($output);

To get list containing first four keys, regardless how they are named:

$wantedKeys = array_slice(array_keys($input), 0, 4);

You can also use aforementioned array_chunk. If you want to get away with one-liner, you can do this:

$output = current(array_chunk($input, 4, true));

Note that it generates warning about references in newer versions of PHP. In such case you can use this:

$output = array_chunk($input, 4, true)[0];

This, however, will generate syntax error on older PHPs.