What are the best practices for ensuring that only selected checkbox values are submitted and displayed in PHP?

To ensure that only selected checkbox values are submitted and displayed in PHP, you can use an array to store the selected values and then only process and display those values. This can be achieved by checking if the checkbox value is present in the submitted form data and then storing it in an array for further processing. 

// Check if form is submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Initialize an empty array to store selected checkbox values
    $selectedValues = array();
    
    // Loop through the checkbox values
    foreach ($_POST['checkbox'] as $value) {
        // Check if the checkbox value is selected
        if (isset($_POST['checkbox'][$value])) {
            // Store the selected value in the array
            $selectedValues[] = $value;
        }
    }
    
    // Display the selected checkbox values
    foreach ($selectedValues as $selectedValue) {
        echo $selectedValue . "<br>";
    }
}

Keywords

PHP checkboxes form submission array_filter array_intersect

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