PHP array of checkbox

Collect multiple checkbox values as an array

Checkboxes that share a name ending in [] arrive in PHP as an array. Treat the field as optional because no value is submitted when none of the boxes are selected.

$selected = $_POST['box'] ?? [];
if (!is_array($selected)) {
    $selected = [];
}

foreach ($selected as $value) {
    echo htmlspecialchars($value, ENT_QUOTES, 'UTF-8') . '
';
}

Validate expected values on the server before using submitted checkbox values in a database or another sensitive operation.

John	Mike	Rone
Mathew	Reid	Simon

Many times we have to display a list of names or records for consideration and out of which user can select any number of records for further action. Here we may not know exactly how many records will be displayed as based on different conditions records will be collected from a table.

We can list the records with a checkbox by the side of it and user can select any number of recodes. We will have one unique id associated with each record and that will be used as value of the check box. Here is the code to display a list and then you can select and submit to see the result.

$box = $_POST['box'] ?? [];
if (!is_array($box)) { $box = []; }
$str = implode(',', array_map('strval', $box));
echo "<pre><code>$str</code></pre>"; 


echo "<form method=post action=''>";
echo "<table border='0' 
cellspacing='0' style='border-collapse: collapse' width='100' >

<tr bgcolor='#ffffff'>
<td width='25%'><input type=checkbox name=box[] value='John'></td>
<td width='25%'>&nbsp;John</td>
<td width='25%'><input type=checkbox name=box[] value='Mike'></td>
<td width='25%'>&nbsp;Mike</td>
<td width='25%'><input type=checkbox name=box[] value='Rone'></td>
<td width='25%'>&nbsp;Rone</td>
</tr>
<tr bgcolor='#f1f1f1'>
<td width='25%'><input type=checkbox name=box[] value='Mathew'></td>
<td width='25%'>&nbsp;Mathew</td>
<td width='25%'><input type=checkbox name=box[] value='Reid'></td>
<td width='25%'>&nbsp;Reid</td>
<td width='25%'><input type=checkbox name=box[] value='Simon'></td>
<td width='25%'>&nbsp;Simon</td>
</tr>

<tr><td colspan =6 align=center><input type=submit 
value=Select></form></td></tr>
</table>";

This is a server side solution and we can get the array value using client side JavaScript we can also get the value of the array of checkboxes.
Modern PHP uses superglobals such as $_POST; the old register_globals setting is historical and must not be relied on.

To remove one extra , at the end of the output we used rtrim function.
In ASP similar script to collect checkbox values of a form is available here.
Array REFERENCE
PHP Form Managing Radio button using PHP

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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This article is written by plus2net.com team. https://www.plus2net.com

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smo1234	18-06-2012
Good one thanks

Getting Check box values using array in PHP

Collect multiple checkbox values as an array

Subhendu Mohapatra