How to Retrieve Multiple Selected Values from a Multi-Select HTML Form in PHP?

Retrieving Multiple Selected Values from a Select Box in PHP

When constructing HTML forms with a select box that allows multiple selections, it's often necessary to retrieve the chosen values in the subsequent PHP script. This article provides a detailed solution for accessing and displaying the selected options from a multi-select box.

Consider the following HTML form:

<form method="get" action="display.php">
  <select name="select2[]" multiple size="3">
    <option value="11">eleven</option>
    <option value="12">twelve</option>
    <option value="13">thirette</option>
    <option value="14">fourteen</option>
    <option value="15">fifteen</option>
  </select>
  <input type="submit" name="Submit" value="Submit">
</form>

To retrieve the selected values in display.php, it's essential to add square brackets [] to the name attribute of the select box:

<select name="select2[]" multiple ...>

This informs PHP to treat $_GET['select2'] as an array. Accessing the array in display.php becomes straightforward:

<?php
header("Content-Type: text/plain");

foreach ($_GET['select2'] as $selectedOption) {
    echo $selectedOption . "\n";
}
?>

By looping through the $_GET['select2'] array, you can retrieve and display each selected value.

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