changelog.php

<?php
// Configuration
$organization = '<your organization>';
$project      = '<your project>';
$token        = '<your token>';
$proxy        = '<proxy>:<port>';
$outline      = '%5s/%6s: %s'."\n".'       fixed: %s'."\n".'         URL: %s'."\n\n";

// Find latest version
exec('git tag', $tags, $return);
usort($tags, 'version_compare');
$latest = array_pop($tags);

// Get commits since latest version
exec('git log ' . $latest . '...HEAD --oneline', $commits, $return);

// Filter commits that reference an issue
foreach ($commits as $commit) {
    if (preg_match('/[close|closes|fix|fixes] #([0-9]+)/i', $commit, $matches) && isset($matches[1])) {
        $issues[] = $matches[1];
    }
    elseif (preg_match('/issue #?([0-9]+)/i', $commit, $matches) && isset($matches[1])) {
        $issues[] = $matches[1];
    }
}

// sort by ID
sort($issues);

// remove doubles
$issues = array_unique($issues);

// Query GitHub
$url     = sprintf('https://api.github.com/repos/%s/%s/issues/', $organization, $project);
$headers = array(
    'Authorization: token ' . $token,
    'User-Agent: php-curl'
);

foreach ($issues as $id) {
    $ch = curl_init($url . $id);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    if($proxy)
        curl_setopt($ch, CURLOPT_PROXY, $proxy);
    // quick & dirty hack for "invalid certificate" error
    //curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

    $issue = json_decode(curl_exec($ch), true);
    // search for labels containing string 'fixed'; you may remove this if you don't need it
    // just remember to remove it from the output line, too
    $fixed = false;
    if(isset($issue['labels']))
        foreach($issue['labels'] as $l)
            if(substr_count($l['name'],'fixed'))
                $fixed = true;
    echo sprintf($outline,$id,$issue['state'],$issue['title'],($fixed?'yes':'no'),$issue['html_url']);
}

Changes:

• enable use behind proxy
• format output line using sprintf()
• added another preg_match() to match string "issue [#]123" as I needed this for my project
• remove doubles from result array
• added a search for labels that contain "fixed" as i needed this for my project
• use 'html_url' instead of 'url' for link

Example output line:

191/  open: Page properties flyout
     fixed: no
       URL: https://github.com/webbird/LEPTON_2_BlackCat/issues/191

Note: I preferred to have multiple lines per issue as oneliners may get quite long. Just tweak $outline to fit your needs.