<?php
    echo '<meta property="og:url" content="http://'.$PowerBB->_SERVER['HTTP_HOST'].$PowerBB->_SERVER['REQUEST_URI'].'">
    ';
    $Default_image = "styles/main/images/logo.png"; // Default image
    $images = array();
    $PowerBB->_CONF['template']['Subject_Info_Row']['text'] = stripslashes($PowerBB->_CONF['template']['Subject_Info_Row']['text']);
    preg_match_all('/src=([\'"])?((?(1).*?|\S+))(?(1)\1)/', $PowerBB->_CONF['template']['Subject_Info_Row']['text'], $images);
    foreach ($images[2] as $src)
    {
    $size = @getimagesize($src);
    if (!@strstr(strtolower($src), ".gif")
    and @strstr(strtolower($src),$PowerBB->_SERVER['HTTP_HOST'])
    and $size[0]> 200)
    {
    echo '<meta property="og:image" content="'.$src.'">
    ';
    }
    else
    {
    echo '<meta property="og:image" content="'.$Default_image.'">
    ';
    }
    break;
    }
    ?>