When a key value in the array in php is null, it is not added to the array.

When a key value in the array in php is null, it is not added to the array.

$data = array();if (!empty($_POST['field_id'])) {foreach ($_POST['field_id'] as $k => $v) {$data[] = array('field_id' => $v, 'choice' => isset($_POST['choice'][$k]) ? $_POST['choice'][$k] : '', 'uid' => $_POST['uid'],'game_id' => $_POST['game_id'],'server_id' => $_POST['server_id']);  }   }  

This is where I cyclically formatted it. below is the output array data

Array(    [0] => Array        (            [field_id] => 1            [choice] => 0            [uid] => 110000110            [game_id] => 2            [server_id] => 2        )    [1] => Array        (            [field_id] => 2            [choice] => 0            [uid] => 110000110            [game_id] => 2            [server_id] => 2        )    [2] => Array        (            [field_id] => 3            [choice] => 1            [uid] => 110000110            [game_id] => 2            [server_id] => 2        ))

When choiece is null, [choice] => if no value exists, how can this problem be solved without adding it to the data array?

Reply to discussion (solution)

[1] => Array
(
[Field_id] => 2
[Choice] =>
[Uid] = & gt; 110000110
[Game_id] => 2
[Server_id] => 2
)
In such a case, 0 and 1 have values.

The data in your example does not contain [choice] =>
If so, do you only need choice items or do not need the whole group?

Isn't it easier for you to compare the $ _ POST ['choice'] loop with the $ _ POST ['Field _ id'] loop?

The data in your example does not contain [choice] =>
If so, do you only need choice items or do not need the whole group?

Isn't it easier for you to compare the $ _ POST ['choice'] loop with the $ _ POST ['Field _ id'] loop?

Array
(
[0] => Array
(
[Field_id] => 1
[Choice] => 0
[Uid] = & gt; 110000110
[Game_id] => 2
[Server_id] => 2
)

[1] => Array
(
[Field_id] => 2
[Choice] =>
[Uid] = & gt; 110000110
[Game_id] => 2
[Server_id] => 2
)

[2] => Array
(
[Field_id] => 3
[Choice] =>
[Uid] = & gt; 110000110
[Game_id] => 2
[Server_id] => 2
)

)

This is probably the effect. if there is no value, it will not be displayed.
Array
(
[0] => Array
(
[Field_id] => 1
[Choice] => 0
[Uid] = & gt; 110000110
[Game_id] => 2
[Server_id] => 2
)
)
If choice has no value, the entire array will not be used.

$data = array();if (!empty($_POST['field_id'])) {   foreach ($_POST['choice'] as $k => $v) {      if($v == '') continue;      $data[] = array(          'field_id' => $_POST['field_id'][$k],           'choice' => $_POST['choice'][$k],           'uid' => $_POST['uid'],          'game_id' => $_POST['game_id'],          'server_id' => $_POST['server_id']      );    }   }

$data = array();if (!empty($_POST['field_id'])) {   foreach ($_POST['choice'] as $k => $v) {      if($v == '') continue;      $data[] = array(          'field_id' => $_POST['field_id'][$k],           'choice' => $_POST['choice'][$k],           'uid' => $_POST['uid'],          'game_id' => $_POST['game_id'],          'server_id' => $_POST['server_id']      );    }   }

Thank you for the moderator. However, if I have already selected the batch addition below, an error will be prompted. in tp, how can I determine whether the addall has been added?

$ Choice = D ('myselect'); // $ choices = $ Choice-> addAll ($ data); if ($ Choice-> addAll ($ data )) {$ back ['status'] = 'success'; $ back ['MSG '] = 'Your bet has been successful! '; $ Back ['URL'] = 'game'; $ this-> back ($ back);} else {$ back ['status'] = 'error '; $ back ['MSG '] = 'betting failed! Don't bet again! '; $ Back ['URL'] = 'game'; $ this-> back ($ back); exit ;}}

If ($ Choice-> addAll ($ data, array (), true) {} saw that mod is false by default. changing to true will change the database value all the time, that makes no sense.
If ($ Choice-> addAll ($ data, array (), false) {} in this case, how can we determine whether a database already exists? do you have any good solutions?