Fluent Forms - Use custom shortcode attr and FF SmartCode to pass dynamic Submit Button text

fluent-forms-dynamic-submit-button-text.php

<?php

// Register Fluent Forms SmartCode
add_filter('fluentform/editor_shortcodes', function ($smartCodes) {
    $smartCodes[0]['shortcodes']['{submit_button_text}'] = 'Dynamic Submit Button Text';
    return $smartCodes;
});

// Use text from submit_button_text attribute on the form's shortcode
add_filter('fluentform/editor_shortcode_callback_submit_button_text', function ($value, $form) {
    $dynamicText = get_query_var('submit_button_text');
    // Set a fallback if nothing is passed
    return $dynamicText ?: 'Schedule Demonstration';
}, 10, 2);

// Store the custom submit button text so it can be used in the SmartCode callback
add_filter('fluentform/shortcode_defaults', function($defaults, $atts) {
    if(isset($atts['submit_button_text'])) {
        set_query_var('submit_button_text', sanitize_text_field($atts['submit_button_text']));
    }
    return $defaults;
}, 10, 2);

Use like this: [fluentform id="1" submit_button_text="Request Info"]