How to let absolute path work on both local and remote servers?

Question

I am creating a website that has to be edited on the local server and then uploaded later on the remote server. I'm using absolute path on the local server but then when I upload it to the remote server, links don't work anymore. It seems that I can only use either relative or absolute, not both.

I want the script to work on both local as well as remote server. Local is obviously for editing (sometimes I used to have slow internet connection so I have to use localhost). And Remote for production purposes and client preview.

Below is the function I created:

PHP SCRIPT:

define("LOCALHOST", "/adamsProject");
define("REMOTE_SERVER", "http://adamsproject.ph");

function host(){
    if(!LOCALHOST){
        echo REMOTE_SERVER;
    }else{
        echo LOCALHOST;
    }
}

EXECUTION ON HTML:

<ul>

    <a href="index.php"><img src=" <?php echo host(); ?> /images/logoMain.png" id="logoMain" > </a>

    <li><a href=" <?php echo host(); ?> /index.php"> HOME </a></li><li>
    <a href="#" id="servicesWide"> SERVICES <i class="fa fa-chevron-down"></i></a></li><li>
    <a href=" <?php echo host(); ?> /underConstruction.php"> ABOUT US </a></li><li>
    <a href=" <?php echo host(); ?> /pages/contactUs.php"> CONTACT US </a></li><li>
    <a href="#" id="folioWide"> PORTFOLIO <i class="fa fa-chevron-down"></i> </a></li>

</ul>

Answer 1

Like DeDee said, You probably want to remove the echos in the link and also the spaces right after the 'host(); ?>' See the code below. Also, no need for the PHP function; you can use "$_SERVER['SERVER_NAME']" that grabs the current web server name. I hope this helps.

if(!$_SERVER['SERVER_NAME']='localhost'){
$domain = '/adamsProject';
} else {
   $domain = 'http://www.adamsproject.ph';   
}
?>
<ul>
<a href="<?php echo $domain;?>/index.php"><img src="<?php echo $domain;?>/images/logoMain.png" id="logoMain" > </a>
<li><a href="<?php echo $domain;?>/index.php"> HOME </a></li><li>
<a href="#" id="servicesWide"> SERVICES <i class="fa fa-chevron-down"></i></a></li><li>
<a href="<?php echo $domain;?>/underConstruction.php"> ABOUT US </a></li><li>
<a href="<?php echo $domain;?>/pages/contactUs.php"> CONTACT US </a></li><li>
<a href="#" id="folioWide"> PORTFOLIO <i class="fa fa-chevron-down"></i></a></li>
</ul>

EDIT Per your comments, if you have a sub directory off of you 'localhost' then you may need a if statement to add your 'adamsProject' directory to your domain when you are on local host. Try that. Let me know.

EDIT2 Replaced remote server domain with your hard coded domain. Also, added $domain to your index.php on home img link and HOME nav link.