PHP Decode

<?php 
 
define( 'DVWA_WEB_PAGE_TO_ROOT', '../../' ); 
require_once DVWA_WEB_PAGE_TO_ROOT . 'dvwa/includes/dvwaPage.inc.php'; 
 
dvwaPageStartup( array( 'authenticated' ) ); 
 
$page = dvwaPageNewGrab(); 
$page[ 'title' ]   = 'Vulnerability: File Upload' . $page[ 'title_separator' ].$page[ 'title' ]; 
$page[ 'page_id' ] = 'upload'; 
$page[ 'help_button' ]   = 'upload'; 
$page[ 'source_button' ] = 'upload'; 
 
dvwaDatabaseConnect(); 
 
$vulnerabilityFile = ''; 
switch( dvwaSecurityLevelGet() ) { 
	case 'low': 
		$vulnerabilityFile = 'low.php'; 
		break; 
	case 'medium': 
		$vulnerabilityFile = 'medium.php'; 
		break; 
	case 'high': 
		$vulnerabilityFile = 'high.php'; 
		break; 
	default: 
		$vulnerabilityFile = 'impossible.php'; 
		break; 
} 
 
require_once DVWA_WEB_PAGE_TO_ROOT . "vulnerabilities/upload/source/{$vulnerabilityFile}"; 
 
// Check if folder is writeable 
$WarningHtml = ''; 
if( !is_writable( $PHPUploadPath ) ) { 
	$WarningHtml .= "<div class=\"warning\">Incorrect folder permissions: {$PHPUploadPath}<br /><em>Folder is not writable.</em></div>"; 
} 
// Is PHP-GD installed? 
if( ( !extension_loaded( 'gd' ) || !function_exists( 'gd_info' ) ) ) { 
	$WarningHtml .= "<div class=\"warning\">The PHP module <em>GD is not installed</em>.</div>"; 
} 
 
$page[ 'body' ] .= " 
<div class=\"body_padded\"> 
	<h1>Vulnerability: File Upload</h1> 
 
	{$WarningHtml} 
 
	<div class=\"vulnerable_code_area\"> 
		<form enctype=\"multipart/form-data\" action=\"#\" method=\"POST\"> 
			<input type=\"hidden\" name=\"MAX_FILE_SIZE\" value=\"100000\" /> 
			Choose an image to upload:<br /><br /> 
			<input name=\"uploaded\" type=\"file\" /><br /> 
			<br /> 
			<input type=\"submit\" name=\"Upload\" value=\"Upload\" />
"; 
 
if( $vulnerabilityFile == 'impossible.php' ) 
	$page[ 'body' ] .= "			" . tokenField(); 
 
$page[ 'body' ] .= " 
		</form> 
		{$html} 
	</div> 
 
	<h2>More Information</h2> 
	<ul> 
		<li>" . dvwaExternalLinkUrlGet( 'https://owasp.org/www-community/vulnerabilities/Unrestricted_File_Upload' ) . "</li> 
		<li>" . dvwaExternalLinkUrlGet( 'https://www.acunetix.com/websitesecurity/upload-forms-threat/' ) . "</li> 
	</ul> 
</div>"; 
 
dvwaHtmlEcho( $page ); 
 
?>