When switching between test websites on subdomains to a live domain, placing absolute URLs in Magento's code can cause many pains later. If you forget where you have created a custom link to a page and later move your site, you will run into 404 errors for missing pages. Luckily, Magento has its own PHP code for for finding the base URL you configured in Magento admin.
Keep this simple yet important line of PHP code handy when typing in your custom URLs. For example if you just want to reference the homepage, use:
If you want to create a link referencing a file you have added, just place this
And good luck.
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