Wordpress从用户输入tel链接中删除空格

Sorry if I am a PHP noob...

I am trying to remove the whitespace from a user's input so that the "tel link" doesn't have any spaces within it.

My code looks like this:

<div class="nt-menu-phone-number">

                <?php

                if( !empty ($nt_theme_options['menu_style1_number'])) { ?>

                    <a href="tel:<?php echo esc_html($nt_theme_options['menu_style1_number']); ?>"><?php echo esc_html($nt_theme_options['menu_style1_number']); ?></a>

                <?php } ?>

</div>

How do I go about removing the whitespace? I have tried putting the trim() function around it but no luck.

Any helps greatly appreciated, thanks.

You can follow u the code that i have given below.

To remove all white spaces in the sting, use preg_replace();

Output: 0812345678

<?php 
$nt_theme_options['menu_style1_number'] = '08 1234 5678';
?>
<div class="nt-menu-phone-number">
<?php
if( !empty ($nt_theme_options['menu_style1_number'])) { ?>
<a href="tel:<?php echo preg_replace('/\s+/', '',$nt_theme_options['menu_style1_number']); ?>"><?php echo preg_replace('/\s+/', '',$nt_theme_options['menu_style1_number']); ?></a>
<?php } ?>
</div>