<?php
declare(strict_types=1);
require_once __DIR__ . '/http-limits.php';

function scanOG(string $url): array {
  $og = array();
  $limits = httpLimits();
  $ctx = stream_context_create([
    'http' => [
      'timeout' => $limits['timeout'],
      'follow_location' => 1,
      'max_redirects' => $limits['max_redirects'],
      'user_agent' => $limits['user_agent'],
      'ignore_errors' => true
    ],
    'ssl' => [
      'verify_peer' => true,
      'verify_peer_name' => true
    ]
  ]);
  $html = @file_get_contents($url, false, $ctx);
  if ($html === false || strlen($html) > $limits['max_bytes']) {
    return $og;
  }

  $re = '/<meta (name|property)=("|\')(.*?)("|\').*?content=("|\')(.*?)("|\')/m';
  preg_match_all($re, $html, $matches, PREG_SET_ORDER, 0);

  foreach($matches as $m) {
    $og[$m[3]] = $m[6];
  }
  //print_r($og);
  return $og;
}
?>