Write a string to a temp file, gunzip it, clean up the temp files and return the decompressed string

gunzipstring.php

<?php
use Exception,
    Zend\Filter\Decompress;


/**
 * The gzip adapter for Zend's decompression filter doesn't always
 * operate reliably on strings. This utility class transparently writes
 * the string to a temp file and then passes it through the filter.
 *
 * The uncompressed result is then available through the get_string()
 * method, or is instantly available through static method get().
 *
 * Usage (#1):
 *
 *     $unzipped_content = GunzipString::get($zipped_content);
 *
 * Usage (#2):
 *
 *     $unzipper = new GunzipString($zipped_content);
 *     $unzipped_content = $unzipper->get_string();
 *
 * @see http://framework.zend.com/manual/2.3/en/modules/zend.filter.set.html#compress-and-decompress
 */
class GunzipString
{
	protected $string   = '';
	protected $success  = false;
	protected $tmp_src  = '';
	protected $tmp_tgt  = '';


	public static function get($string) {
		$unzip = new self($string);
		return $unzip->get_string();
	}

	public function __construct($string) {
		$this->success = ($this->create_temp_file($string) && $this->decompress());
	}

	protected function create_temp_file($string) {
		$this->tmp_src = tempnam(sys_get_temp_dir(), 'scanwp');
		$this->tmp_tgt = tempnam(sys_get_temp_dir(), 'scanwp');
		return ( $this->tmp_src && file_put_contents($this->tmp_src, $string));
	}

	protected function decompress() {
		try {
			$this->do_decompression();
			$this->do_cleanup();
			return true;
		}
		catch (Exception $e) {
			return false;
		}
	}

	protected function do_decompression() {
		$filter = new Decompress([
			'adapter' => 'gz',
			'options' => [
				'archive' => $this->tmp_src,
				'target'  => $this->tmp_tgt
			]
		]);

		$this->string = $filter->filter($this->tmp_src);
	}

	protected function do_cleanup() {
		unlink($this->tmp_src);
		unlink($this->tmp_tgt);
	}

	public function was_successful() {
		return $this->success;
	}

	public function get_string() {
		return $this->string;
	}
}