Wraps the PHP Stack trace of a wab page you are developing for better visualization

stack_trace.php

#!/usr/bin/env php
<?php
/**
 * Wraps the PHP Stack trace of a wab page you are developing for better
 * visualization
 *
 * Recomended usage:
 *
 * 1. Open your terminal and run
 *
 *     while true; do ./stack_trace.php "[url]" > preview.md; sleep [sec]; done
 *
 *   - Replace [url] by the one you are developing. Default: http://localhost/
 *   - Replace [sec] by the frequence to update
 *
 * 2. Open the output file on Atom and enable Markdown Preview (ctrl-shift-m)
 *
 * 3. Optionally, put the preview in the bottom pane
 *
 * NOTE:
 * - Remember to enable the Live Update in the package
 * - It would be nice if the preview kept your scroll position.. You can kill
 *   the command in the terminal, analyze the preview, then rerun the command
 *
 * @author Aryel Mota Góis
 * @license MIT
 */

// read argument
$url = $argv[1] ?? 'http://localhost/';

// load html
$html = file_get_contents($url);

// wrap PHP Stack trace
$start = strpos($html, "Stack trace:\n");
if ($start !== false) {
    $wrap = "<br />\n<pre><code>"
          . substr($html, $start)
          . '</code></pre>';
    $html = substr_replace($html, $wrap, $start);
}

// output
echo $html;