A very simple class to make extraction of bookmarks from Chrome and Firefox easier.

gistfile1.php

<?php

/**
 * A very simple class to make extraction of bookmarks from Chrome and Firefox
 * easier. Bookmarks need to be exported from the browser in order to be read.
 * 
 * Example:
 * $bp = new BookmarkParser(
 *     array(
 *         "bookmarks_chrome.html",
 *         "bookmarks_firefox.html"
 *     )
 * );
 * 
 * var_dump($bp->getBookmarks());
 */
class BookmarkParser
{
    private $bookmarks;
    private $source;

    /**
     * Loads all specified source files
     * @param string[] $sources
     */
    public function __construct($sources)
    {
        $this->source = array();

        if (!is_array($sources)) {
            $sources = (array)$sources;
        }

        foreach ($sources as $source) {
            $this->source = array_merge($this->source, file($source));
        }
    }

    /**
     * Parses source files and extracts bookmark data
     */
    private function extractBookmarks()
    {
        $this->bookmarks = array();

        foreach ($this->source as $line) {
            // Makes sure the line is a bookmark
            if (strpos($line, "<A") !== false) {
                $bookmark = array();
                $line = trim($line);

                $url = $this->extractString("HREF=\"", "\"", $line);

                // To remove Firefox links
                if (substr($url, 0, 6) === "place:") {
                    continue;
                }

                $this->bookmarks[$url] = array(
                    'url' => $url,
                    'date' => $this->extractString("DATE=\"", "\"", $line),
                    'icon' => $this->extractString("ICON=\"", "\"", $line),
                    'name' => $this->extractString("\">", "<", $line),
                );
            }
        }
    }

    /**
     * Extracts a substring from a string
     * @param  string $start
     * @param  string $end
     * @param  string $source
     * @return string|null Returns null if delimiter wasn't found
     */
    private function extractString($start, $end, $source)
    {
        $offset = strpos($source, $start);

        if ($offset === false) {
            return null;
        }

        $offset += strlen($start);
        $end = strpos($source, $end, $offset);
        $length = $end - $offset;

        return substr($source, $offset, $length);
    }

    /**
     * Fetches the parsed bookmarks
     * @return string[][]
     */
    public function getBookmarks()
    {
        if (!isset($this->bookmarks)) {
            $this->extractBookmarks();
        }

        return $this->bookmarks;
    }
}