What is the best practice for handling checkbox values in PHP forms to generate a concatenated string?

When dealing with checkbox values in PHP forms, it is best to use an array to store the selected values and then concatenate them into a single string if needed. This approach allows for easy manipulation and processing of the selected values without the need for complex logic. 

// Assuming the form has checkboxes with name 'checkbox[]'
$selectedValues = $_POST['checkbox'] ?? []; // Retrieve selected checkbox values as an array

if (!empty($selectedValues)) {
    $concatenatedString = implode(',', $selectedValues); // Concatenate selected values into a comma-separated string
    echo $concatenatedString;
} else {
    echo "No checkboxes were selected.";
}

Keywords

PHP forms checkbox values concatenated string handling

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