<?php

$r = [
	'example.com',
	'http://e...content-available-to-author-only...e.com',
	'http://w...content-available-to-author-only...e.com',
	'https://e...content-available-to-author-only...e.com',
	'https://w...content-available-to-author-only...e.com'
	];


foreach($r as $url){
//echo substr($url, 0, 7) . "\n";
 if (strrpos($url, "http") !== 0) {
           $new_url = "http://" . $url;
           echo "Changed $url to $new_url\n";
 } else 
       echo "No change to $url\n";
}