Function to list file formats inside a ZIP file

I'm looking for a function that will take a specified ZIP file, and list the file extensions of each file in the ZIP. For example, if the ZIP has a text file and a MIDI file in it, I'd like it to print ".txt, .mid"

 

$file = 'full/path/to/file.zip';

$contents = array();

if (is_resource(($zip = zip_open($file))))
{
	while ($zip_entry = zip_read($zip))
	{
		$contents[] = end(explode('.', zip_entry_name($zip_entry)));		
	}

	zip_close($zip);
}

echo implode(', ', $contents);

PHP:

 

Didn't work unfortunately. In fact it sorta blows up whatever page you put this on. I put this into a drupal page and all that returned was a blank white page. Then I tried just putting it into a raw .php file and uploaded it to my public_html directory, still just a blank page.

 

I tested it and it does work. You need to specify the FULL path to the file.

If you're unsure, try something like this.

$file = getcwd() . '/file.zip';

PHP:

As for Drupal, I have no idea, I think it might not be possible to enter it just like that. I'm not sure if they're using templates or something, but echoing the output just randomly in the middle could possibly cause errors.

 

Hmm, I must be doing something stupid then, cause its just not working. I'm using PHP 5.2.3 if that's relevant.

 

Perhaps you don't have the ZIP library installed. But you should get an undefined function error then.

Try setting these 2 lines at the top of the script to see if you get any errors.

error_reporting(E_ALL);
ini_set('display_errors', '1');

PHP:

 

Yep, looks like you got it:

Fatal error: Call to undefined function zip_open() in /home/gametabs/public_html/zip.php on line 10

Code (markup):

I was gonna say, where are the $zip and $zip_open variables declared? But I'm assuming they're a part of a ZIP library I don't have installed. Or at least $zip_open is.

 

Before complicating our lives, let's take a native class from phpclasses.org.

This one to be exact.

class.zip.php

<?php

class zipfile
{
	/*
		zipfile class, for reading or writing .zip files
		See http://www.gamingg.net for more of my work
		Based on tutorial given by John Coggeshall at http://www.zend.com/zend/spotlight/creating-zip-files3.php
		Copyright (C) Joshua Townsend and licensed under the GPL
		Version 1.0
	*/
	var $datasec = array(); // array to store compressed data
	var $files = array(); // array of uncompressed files
	var $dirs = array(); // array of directories that have been created already
	var $ctrl_dir = array(); // central directory
	var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00"; //end of Central directory record
	var $old_offset = 0;
	var $basedir = ".";




	function read_zip($name)
	{
		// Clear current file
		$this->datasec = array();

		// File information
		$this->name = $name;
		$this->mtime = filemtime($name);
		$this->size = filesize($name);

		// Read file
		$fh = fopen($name, "rb");
		$filedata = fread($fh, $this->size);
		fclose($fh);

		// Break into sections
		$filesecta = explode("\x50\x4b\x05\x06", $filedata);

		// ZIP Comment
		$unpackeda = unpack('x16/v1length', $filesecta[1]);
		$this->comment = substr($filesecta[1], 18, $unpackeda['length']);
		$this->comment = str_replace(array("\r\n", "\r"), "\n", $this->comment); // CR + LF and CR -> LF

		// Cut entries from the central directory
		$filesecta = explode("\x50\x4b\x01\x02", $filedata);
		$filesecta = explode("\x50\x4b\x03\x04", $filesecta[0]);
		array_shift($filesecta); // Removes empty entry/signature

		foreach($filesecta as $filedata)
		{
			// CRC:crc, FD:file date, FT: file time, CM: compression method, GPF: general purpose flag, VN: version needed, CS: compressed size, UCS: uncompressed size, FNL: filename length
			$entrya = array();
			$entrya['error'] = "";

			$unpackeda = unpack("v1version/v1general_purpose/v1compress_method/v1file_time/v1file_date/V1crc/V1size_compressed/V1size_uncompressed/v1filename_length", $filedata);

			// Check for encryption
			$isencrypted = (($unpackeda['general_purpose'] & 0x0001) ? true : false);

			// Check for value block after compressed data
			if($unpackeda['general_purpose'] & 0x0008)
			{
				$unpackeda2 = unpack("V1crc/V1size_compressed/V1size_uncompressed", substr($filedata, -12));

				$unpackeda['crc'] = $unpackeda2['crc'];
				$unpackeda['size_compressed'] = $unpackeda2['size_uncompressed'];
				$unpackeda['size_uncompressed'] = $unpackeda2['size_uncompressed'];

				unset($unpackeda2);
			}

			$entrya['name'] = substr($filedata, 26, $unpackeda['filename_length']);

			if(substr($entrya['name'], -1) == "/") // skip directories
			{
				continue;
			}

			$entrya['dir'] = dirname($entrya['name']);
			$entrya['dir'] = ($entrya['dir'] == "." ? "" : $entrya['dir']);
			$entrya['name'] = basename($entrya['name']);


			$filedata = substr($filedata, 26 + $unpackeda['filename_length']);

			if(strlen($filedata) != $unpackeda['size_compressed'])
			{
				$entrya['error'] = "Compressed size is not equal to the value given in header.";
			}

			if($isencrypted)
			{
				$entrya['error'] = "Encryption is not supported.";
			}
			else
			{
				switch($unpackeda['compress_method'])
				{
					case 0: // Stored
						// Not compressed, continue
					break;
					case 8: // Deflated
						$filedata = gzinflate($filedata);
					break;
					case 12: // BZIP2
						if(!extension_loaded("bz2"))
						{
							@dl((strtolower(substr(PHP_OS, 0, 3)) == "win") ? "php_bz2.dll" : "bz2.so");
						}

						if(extension_loaded("bz2"))
						{
							$filedata = bzdecompress($filedata);
						}
						else
						{
							$entrya['error'] = "Required BZIP2 Extension not available.";
						}
					break;
					default:
						$entrya['error'] = "Compression method ({$unpackeda['compress_method']}) not supported.";
				}

				if(!$entrya['error'])
				{
					if($filedata === false)
					{
						$entrya['error'] = "Decompression failed.";
					}
					elseif(strlen($filedata) != $unpackeda['size_uncompressed'])
					{
						$entrya['error'] = "File size is not equal to the value given in header.";
					}
					elseif(crc32($filedata) != $unpackeda['crc'])
					{
						$entrya['error'] = "CRC32 checksum is not equal to the value given in header.";
					}
				}

				$entrya['filemtime'] = mktime(($unpackeda['file_time']  & 0xf800) >> 11,($unpackeda['file_time']  & 0x07e0) >>  5, ($unpackeda['file_time']  & 0x001f) <<  1, ($unpackeda['file_date']  & 0x01e0) >>  5, ($unpackeda['file_date']  & 0x001f), (($unpackeda['file_date'] & 0xfe00) >>  9) + 1980);
				$entrya['data'] = $filedata;
			}

			$this->files[] = $entrya;
		}

		return $this->files;
	}

}
?>

PHP:

(Note: I removed all unnecessary methods from the class)

<?php

include 'class.zip.php';

$file = 'file.zip';

$zip = new zipfile();
$content = array();

foreach ($zip->read_zip($file) AS $filedata)
{
	$content[] = end(explode('.', $filedata['name']));
}

echo implode(', ', $content);

?>

PHP:

 

You sir, are a god amongst men

 

MY host just installed zlib for me. Do I still need to include the zipfile class?

 

If they installed zlib you can use the first code without any includes.