Pass selected form input to backend - php

Question

Consider a simple HTML form like
<form>
<div>
<input type='checkbox' name='selections[]' value='1' />
<input type='text' name="inputs[]" value='' />
</div>
<div>
<input type='checkbox' name='selections[]' value='2' />
<input type='text' name="inputs[]" value='' />
</div>
<div>
<input type='checkbox' name='selections[]' value='3' />
<input type='text' name="inputs[]" value='' />
</div>
</form>
There are three rows, assume only the 2nd, 3rd rows are checked, and all three text inputs are filled with (a, b, c), so in my backend (PHP), I can have two arrays
e.g.
$selections = array(2, 3);
$inputs = array('a', 'b', 'c');
What is the easy way to remove a from the $inputs since the checkbox is not checked? i.e. So I can loop the two arrays more easily.

Answer 1

I'd probably use array_map
$inputs = array_map(function($v) use ($inputs) {
return $inputs[$v - 1];
}, $selections);
Though MingShun's answer will work fine if converted to PHP

Answer 2

You should change your HTML like this:
<form method="post">
<div>
<input type='checkbox' name='data[0][selections]' value='1' />
<input type='text' name="data[0][inputs]" value='' />
</div>
<div>
<input type='checkbox' name='data[1][selections]' value='2' />
<input type='text' name="data[1][inputs]" value='' />
</div>
<div>
<input type='checkbox' name='data[2][selections]' value='3' />
<input type='text' name="data[2][inputs]" value='' />
</div>
<input type="submit"/>
TEST DATA:
<?php
echo '<pre>';
print_r($_POST['data']);
?>
RESULT:
Array
(
[0] => Array
(
[selections] => 1
[inputs] => 1
)
[1] => Array
(
[selections] => 2
[inputs] => 2
)
[2] => Array
(
[selections] => 3
[inputs] => 3
)
)
OR:
Array
(
[0] => Array
(
[inputs] => 1
)
[1] => Array
(
[selections] => 2
[inputs] => 2
)
[2] => Array
(
[selections] => 3
[inputs] => 3
)
)
Now you can loop result and handle.
$selections = array();
$inputs = array();
foreach ($_POST['data'] as $item){
if (!empty($item['selections']) && !empty($item['inputs'])){
$selections[] = $item['selections'];
$inputs[] = $item['inputs'];
}
}
var_dump($selections);
var_dump($inputs);

Answer 3

This answer requires detailed knowledge of what's coming in. Which is rather bad if you want to reuse it.
The following assumptions are being made about the html page:
The row values start from 1
The row values are ascending
The row values are continuous. e.g. 1, 2, 3... not 1, 2, 4...
And here's the code:
$len = count($selections);
for ($i = 0; $i < $len; $i++)
{
if (!in_array($i + 1, $selections))
unset($inputs[$i]);
}