Some crappy parser in php

knigi.php

<meta name="referrer" content="no-referrer" />
<form action="mAx-knigi.php" method="post">
  URL: <input type="text" name="url"><br>
  <input type="submit" value="Submit">
</form><br><br>
<?php
if(isset($_POST['url']) && strlen($_POST['url']) > 10)
{
	$url = parse_url($_POST['url'], PHP_URL_PATH);
	$page = file_get_contents('https://domain/'.$url);
	if(strlen($page) < 100)
		exit('ERROR1: Book page download failed');
	preg_match_all('~\$\(document\)\.audioPlayer\(([0-9]+),0\);~', $page, $m);
	if(isset($m[1][0]))
	{
		$id = $m[1][0];
		$pagerest = file_get_contents('https://domain/rest/bid/'.$id);
		if(strlen($pagerest) < 50)
			exit('ERROR2: List page download failed!');
		
		$json = json_decode($pagerest, true);
		print_r($json, true);
		if(is_array($json) && sizeof($json))
		{
			foreach($json as $entry)
			{
				echo "<a href='".$entry['mp3']."'>".$entry['title']."</a><br>";
			}
			
			echo '<br><br><textarea name="comment" rows="20" cols="160">';
			foreach($json as $entry)
			{
				$encoded_url = preg_replace_callback('#://([^/]+)/([^?]+)#', function ($match) {
					return '://' . $match[1] . '/' . join('/', array_map('rawurlencode', explode('/', $match[2])));
				}, $entry['mp3']);
				echo $encoded_url.PHP_EOL;
			}
			echo '</textarea>';
			
		}
	}
}