- file_get_contents: documentation ( source)
- json_decode: documentation ( source)
- print_r: documentation ( source)
<?php
$url="https://raw.githubusercontent.com/dmfilipenko/timezones.json/master/timezones.json";
foreach(json_decode(file_get_contents($url), true) as $tz){
if($tzs[$tz['abbr']]) print_r($tz);
$tzs[$tz['abbr']]=true;
}