How to Access and Retrieve Form Variables Sent via POST in PHP?

How to Retrieve All Variables Transmitted via POST

When handling POST data, PHP automatically populates the $_POST array. An array's components represent the data associated with form input elements.

To view the contents of the $_POST array, simply use var_dump($_POST);, or you can access individual values by specifying their corresponding array key (e.g., $name = $_POST["name"];).

Assuming your form is using the usual encoding method (enctype="multipart/form-data"), you can check whether a checkbox is selected using the following syntax:

<code class="php">if (isset($_POST['myCheckbox']) && $_POST['myCheckbox'] == 'Yes') {
    ...
}</code>

If you have an array of checkboxes, where each checkbox has a unique "value" attribute, the selected values will be available as an array. To access this array, use the syntax: $arrayName = $_POST["arrayName[]"];. Here's an example:

<input type="checkbox" name="myCheckbox[]" value="A" />val1
<input type="checkbox" name="myCheckbox[]" value="B" />val2
<input type="checkbox" name="myCheckbox[]" value="C" />val3

By using [] in the checkbox name, the selected values will be available in an array called $_POST['myCheckbox'].

The above is the detailed content of How to Access and Retrieve Form Variables Sent via POST in PHP?. For more information, please follow other related articles on the PHP Chinese website!