Sigma uses this code:
File item-sidebar.php
<?php
/*
* Copyright 2014 Osclass
* Copyright 2021 Osclass by OsclassPoint.com
*
* Osclass maintained & developed by OsclassPoint.com
* You may not use this file except in compliance with the License.
* You may download copy of Osclass at
*
*
https://osclass-classifieds.com/download *
* Do not edit or add to this file if you wish to upgrade Osclass to newer
* versions in the future. Software is distributed on an "AS IS" basis, without
* warranties or conditions of any kind, either express or implied. Do not remove
* this NOTICE section as it contains license information and copyrights.
*/
?>
<div id="sidebar">
<?php if( osc_price_enabled_at_items() ) { ?><div class="price isDesktop isTablet"><?php echo osc_item_formated_price(); ?></div><?php } ?>
<?php if(!osc_is_web_user_logged_in() || osc_logged_user_id()!=osc_item_user_id()) { ?>
<form action="<?php echo osc_base_url(true); ?>" method="post" name="mask_as_form" id="mask_as_form">
<input type="hidden" name="id" value="<?php echo osc_item_id(); ?>" />
<input type="hidden" name="as" value="spam" />
<input type="hidden" name="action" value="mark" />
<input type="hidden" name="page" value="item" />
<select name="as" id="as" class="mark_as">
<option><?php _e("Mark as...", 'sigma'); ?></option>
<option value="spam"><?php _e("Mark as spam", 'sigma'); ?></option>
<option value="badcat"><?php _e("Mark as misclassified", 'sigma'); ?></option>
<option value="repeated"><?php _e("Mark as duplicated", 'sigma'); ?></option>
<option value="expired"><?php _e("Mark as expired", 'sigma'); ?></option>
<option value="offensive"><?php _e("Mark as offensive", 'sigma'); ?></option>
</select>
</form>
<?php } ?>
<?php if( osc_get_preference('sidebar-300x250', 'sigma') != '') {?>
<!-- sidebar ad 350x250 -->
<div class="ads_300">
<?php echo osc_get_preference('sidebar-300x250', 'sigma'); ?>
</div>
<!-- /sidebar ad 350x250 -->
<?php } ?>
<div id="contact" class="widget-box form-container form-vertical">
<h2><?php _e("Contact publisher", 'sigma'); ?></h2>
<?php if(osc_profile_img_users_enabled()) { ?>
<p class="user-img">
<img src="<?php echo osc_user_profile_img_url(osc_item_user_id()); ?>" alt="<?php echo osc_esc_html(osc_item_contact_name()); ?>"/>
</p>
<?php } ?>
<?php if( osc_item_user_id() != null ) { ?>
<p class="name bld"><span><?php _e('Name', 'sigma') ?>:</span> <a href="<?php echo osc_user_public_profile_url( osc_item_user_id() ); ?>" ><?php echo osc_item_contact_name(); ?></a> <?php echo (osc_user_is_online(osc_item_user_id()) ? '<span class="is-online">(' . __('online', 'sigma') . ')</span>' : ''); ?></p>
<?php } else { ?>
<p class="name bld"><span><?php _e('Name', 'sigma'); ?>:</span> <?php echo osc_item_contact_name(); ?></p>
<?php } ?>
<?php if( osc_item_show_email() ) { ?>
<p class="email bld"><span><?php _e('E-mail', 'sigma'); ?>:</span> <a href="mailto:<?php echo osc_item_contact_email(); ?>"><?php echo osc_item_contact_email(); ?></a></p>
<?php } ?>
<?php if ( osc_item_contact_phone() != '' && osc_item_show_phone()) { ?>
<p class="phone bld"><span><?php _e('Phone', 'sigma'); ?>:</span> <?php echo '<a href="tel:' . osc_item_contact_phone(true) . '">' . osc_item_contact_phone(false) . '</a>'; ?></p>
<?php } ?>
<?php if ( osc_item_contact_other() != '' ) { ?>
<p class="other bld"><span><?php _e('Other', 'sigma'); ?>:</span> <?php echo osc_item_contact_other(); ?></p>
<?php } ?>
<a href="#contact-in" class="resp-toogle btn btn-secondary show-contact-btn"><?php _e('Contact seller', 'sigma'); ?></a>
<div id="contact-in" class="fixed-layout">
<div class="fixed-close"><i class="fas fa-times"></i></div>
<?php if( osc_item_is_expired () ) { ?>
<p class="problem expired">
<?php _e("The listing is expired. You can't contact the publisher.", 'sigma'); ?>
</p>
<?php } else if( ( osc_logged_user_id() == osc_item_user_id() ) && osc_logged_user_id() != 0 ) { ?>
<p class="problem own">
<?php _e("It's your own listing, you can't contact the publisher.", 'sigma'); ?>
</p>
<?php } else if( osc_reg_user_can_contact() && !osc_is_web_user_logged_in() ) { ?>
<p class="problem unlogged">
<?php _e("You must log in or register a new account in order to contact the advertiser", 'sigma'); ?>
</p>
<a href="<?php echo osc_user_login_url(); ?>" class="btn btn-secondary lgn"><?php _e('Login', 'sigma'); ?></a>
<?php } else { ?>
<ul id="error_list"></ul>
<form action="<?php echo osc_base_url(true); ?>" method="post" name="contact_form" id="contact_form" <?php if(osc_item_attachment()) { echo 'enctype="multipart/form-data"'; };?> >
<?php osc_prepare_user_info(); ?>
<input type="hidden" name="action" value="contact_post" />
<input type="hidden" name="page" value="item" />
<input type="hidden" name="id" value="<?php echo osc_item_id(); ?>" />
<div class="control-group">
<label class="control-label" for="yourName"><?php _e('Your name', 'sigma'); ?>:</label>
<div class="controls"><?php ContactForm::your_name(); ?></div>
</div>
<div class="control-group">
<label class="control-label" for="yourEmail"><?php _e('Your e-mail address', 'sigma'); ?>:</label>
<div class="controls"><?php ContactForm::your_email(); ?></div>
</div>
<div class="control-group">
<label class="control-label" for="phoneNumber"><?php _e('Phone number', 'sigma'); ?> (<?php _e('optional', 'sigma'); ?>):</label>
<div class="controls"><?php ContactForm::your_phone_number(); ?></div>
</div>
<div class="control-group">
<label class="control-label" for="message"><?php _e('Message', 'sigma'); ?>:</label>
<div class="controls textarea"><?php ContactForm::your_message(); ?></div>
</div>
<?php if(osc_item_attachment()) { ?>
<div class="control-group">
<label class="control-label" for="attachment"><?php _e('Attachment', 'sigma'); ?>:</label>
<div class="controls"><?php ContactForm::your_attachment(); ?></div>
</div>
<?php }; ?>
<div class="control-group">
<div class="controls">
<?php osc_run_hook('item_contact_form', osc_item_id()); ?>
<?php osc_show_recaptcha(); ?>
<button type="submit" class="btn btn-primary"><?php _e("Send", 'sigma');?></button>
</div>
</div>
</form>
<?php ContactForm::js_validation(); ?>
<?php } ?>
</div>
</div>
<div id="useful_info">
<h2><?php _e('Useful information', 'sigma'); ?></h2>
<ul>
<li><?php _e('Avoid scams by acting locally or paying with PayPal', 'sigma'); ?></li>
<li><?php _e('Never pay with Western Union, Moneygram or other anonymous payment services', 'sigma'); ?></li>
<li><?php _e('Don\'t buy or sell outside of your country. Don\'t accept cashier cheques from outside your country', 'sigma'); ?></li>
<li><?php _e('This site is never involved in any transaction, and does not handle payments, shipping, guarantee transactions, provide escrow services, or offer "buyer protection" or "seller certification"', 'sigma'); ?></li>
</ul>
</div>
</div><!-- /sidebar -->