How can PHP be used to preselect dropdown options based on data read from a text file?

When reading data from a text file in PHP to preselect dropdown options, you can store the selected value in a variable and compare it with the options in the dropdown. If the value matches, you can use the "selected" attribute in the HTML option tag to preselect it. 

<?php
// Read data from text file
$selected_option = trim(file_get_contents('selected_option.txt'));

// Dropdown options
$options = ['Option 1', 'Option 2', 'Option 3'];

// Display dropdown with preselected option
echo '<select name="dropdown">';
foreach ($options as $option) {
    if ($option == $selected_option) {
        echo '<option value="' . $option . '" selected>' . $option . '</option>';
    } else {
        echo '<option value="' . $option . '">' . $option . '</option>';
    }
}
echo '</select>';
?>

Keywords

PHP dropdown preselect text file data extraction

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