Extract images from a zip archive

For my second example of using my image thumbnailer I’ve thrown together a little script which accepts a zip archive upload containing images and generates and returns to the browser a new zip archive containing a thumbnail for each image in the original.

Form to upload a zip file containing images

After processing a new zip is sent to the browser containing thumbnails

Source code download at the end of this page.

zip2thumb.php

<?php
require_once dirname(__FILE__) . '/paGdThumbnail.php';

$thumb_width = 150;
$thumb_height = 150;
$thumb_quality = 75;
$thumb_method = 'crop';
$thumb_bgColour = array(0,0,0);

// give us lots of time
set_time_limit(0);

// use to store error messages in.
$error = '';

$errors = array(
	UPLOAD_ERR_INI_SIZE => 'The uploaded file exceeds the upload_max_filesize directive in php.ini.',
	UPLOAD_ERR_FORM_SIZE => 'The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form.',
	UPLOAD_ERR_PARTIAL => 'The uploaded file was only partially uploaded.',
	UPLOAD_ERR_NO_FILE => 'No file was uploaded.',
	UPLOAD_ERR_NO_TMP_DIR => 'Missing a temporary folder.',
	UPLOAD_ERR_CANT_WRITE => 'Failed to write file to disk.',
	UPLOAD_ERR_EXTENSION => 'File upload stopped by extension.'
);

// get url to link to thumbs
$pathinfo = pathinfo($_SERVER['SCRIPT_NAME']);
$download_url = 'http://'.$_SERVER['HTTP_HOST'] . '/' . $pathinfo['dirname'] . '/thumbs.zip';

// has the form been submitted?
if( isset($_POST['submit']) ){

	// was a file submitted?
	if( isset($_FILES['zip']) ){
		// any errors?
		if( !$_FILES['zip']['error'] ){
			// security check
			if( is_uploaded_file($_FILES['zip']['tmp_name']) ){
				// is it a zip file?
				if( preg_match('#.zip$#i', $_FILES['zip']['name']) ){

					// get the thumbnail options from the form
					$thumb_width = (int)$_POST['thumb_width'];
					$thumb_height = (int)$_POST['thumb_height'];
					$thumb_method = $_POST['thumb_method'];

					// create a zip archive object
					$zip = new ZipArchive();
					if( $zip->open($_FILES['zip']['tmp_name']) ){
						$output_name = 'thumbs.zip';
						// create output archive
						$output = new ZipArchive();
						if( $output->open($output_name, ZipArchive::OVERWRITE ) ){

							// loop through all the files in the archive
							for( $i = 0; $i < $zip->numFiles; $i++){
								$entry = $zip->statIndex($i);
								// is it an image?	
								if( $entry['size'] > 0 && preg_match('#.(jpg|gif|png)$#i', $entry['name'] ) ){
									$file = $zip->getFromIndex($i);
									if( $file ){
										$image = imagecreatefromstring($file);
										if( $image ){
											$thumb = paGdThumbnail($image, $thumb_width, $thumb_height, $thumb_method, $thumb_bgColour);
											imagedestroy($image);
											if( $thumb ){
												ob_start();
												imagejpeg($thumb,null,$thumb_quality);
												imagedestroy($thumb);
												$thumb_data = ob_get_clean();
												$output->addFromString(preg_replace('#.(jpg|gif|png)$#i', '_t.jpg', $entry['name']), $thumb_data);
											}
										}
									}
								}
							}
							$output->close();
						}
						$zip->close();
						header("Location: $download_url");
						exit();
					}
				}
				else{

				}
			}
		}
		// display an error message
		else{
			$error = $errors[$_FILES['zip']['error']];
		}

	}

}

?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>Zip to Thumbnails :p</title>
</head>
<body>
	<h2>Upload a zip archive containing images in jpeg, png or gif format.</h2>
	<p>You will receive a zip archive containing a thumbnail for each image in the original archive.</p>
	<p>Select the thumbnail width, height and method using the form below.</p>
<?php if( $error ){ ?>
	<h3 style="color: red;"><?php echo $error?></h3>
<?php } ?>
	<form action="<?php echo $_SERVER['SCRIPT_NAME']?>" method="post" enctype="multipart/form-data">
		<input type="file" name="zip" />
		Width: <input type="text" name="thumb_width" value="<?php echo $thumb_width?>" size="4" />
		Height: <input type="text" name="thumb_width" value="<?php echo $thumb_width?>" size="4" />
		<select name="thumb_method">
			<option value="crop">Crop</option>
			<option value="scale"<?php if( $thumb_method == 'scale' ) echo ' selected="selected" '?>>Scale</option>
		</select>
		<input type="submit" name="submit" value="Create Thumbnails" />
	</form>
</body>
</html>

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<?php

require_once dirname(__FILE__) . '/paGdThumbnail.php';

$thumb_width = 150;

$thumb_height = 150;

$thumb_quality = 75;

$thumb_method = 'crop';

$thumb_bgColour = array(0,0,0);

// give us lots of time

set_time_limit(0);

// use to store error messages in.

$error = '';

$errors = array(

UPLOAD_ERR_INI_SIZE => 'The uploaded file exceeds the upload_max_filesize directive in php.ini.',

UPLOAD_ERR_FORM_SIZE => 'The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form.',

UPLOAD_ERR_PARTIAL => 'The uploaded file was only partially uploaded.',

UPLOAD_ERR_NO_FILE => 'No file was uploaded.',

UPLOAD_ERR_NO_TMP_DIR => 'Missing a temporary folder.',

UPLOAD_ERR_CANT_WRITE => 'Failed to write file to disk.',

UPLOAD_ERR_EXTENSION => 'File upload stopped by extension.'

);

// get url to link to thumbs

$pathinfo = pathinfo($_SERVER['SCRIPT_NAME']);

$download_url = 'http://'.$_SERVER['HTTP_HOST'] . '/' . $pathinfo['dirname'] . '/thumbs.zip';

// has the form been submitted?

if( isset($_POST['submit']) ){

// was a file submitted?

if( isset($_FILES['zip']) ){

// any errors?

if( !$_FILES['zip']['error'] ){

// security check

if( is_uploaded_file($_FILES['zip']['tmp_name']) ){

// is it a zip file?

if( preg_match('#.zip$#i', $_FILES['zip']['name']) ){

// get the thumbnail options from the form

$thumb_width = (int)$_POST['thumb_width'];

$thumb_height = (int)$_POST['thumb_height'];

$thumb_method = $_POST['thumb_method'];

// create a zip archive object

$zip = new ZipArchive();

if( $zip->open($_FILES['zip']['tmp_name']) ){

$output_name = 'thumbs.zip';

// create output archive

$output = new ZipArchive();

if( $output->open($output_name, ZipArchive::OVERWRITE ) ){

// loop through all the files in the archive

for( $i = 0; $i < $zip->numFiles; $i++){

$entry = $zip->statIndex($i);

// is it an image?

if( $entry['size'] > 0 && preg_match('#.(jpg|gif|png)$#i', $entry['name'] ) ){

$file = $zip->getFromIndex($i);

if( $file ){

$image = imagecreatefromstring($file);

if( $image ){

$thumb = paGdThumbnail($image, $thumb_width, $thumb_height, $thumb_method, $thumb_bgColour);

imagedestroy($image);

if( $thumb ){

ob_start();

imagejpeg($thumb,null,$thumb_quality);

imagedestroy($thumb);

$thumb_data = ob_get_clean();

$output->addFromString(preg_replace('#.(jpg|gif|png)$#i', '_t.jpg', $entry['name']), $thumb_data);

}

$output->close();

}

$zip->close();

header("Location: $download_url");

exit();

}

else{

}

// display an error message

else{

$error = $errors[$_FILES['zip']['error']];

}

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<html>

<head>

<title>Zip to Thumbnails :p</title>

</head>

<body>

<h2>Upload a zip archive containing images in jpeg, png or gif format.</h2>

<p>You will receive a zip archive containing a thumbnail for each image in the original archive.</p>

<p>Select the thumbnail width, height and method using the form below.</p>

<?php if( $error ){ ?>

<?php } ?>

<form action="<?php echo $_SERVER['SCRIPT_NAME']?>" method="post" enctype="multipart/form-data">

Width: <input type="text" name="thumb_width" value="<?php echo $thumb_width?>" size="4" />

Height: <input type="text" name="thumb_width" value="<?php echo $thumb_width?>" size="4" />

<option value="scale"<?php if( $thumb_method == 'scale' ) echo ' selected="selected" '?>>Scale</option>

</select>

</form>

</body>

</html>

Download from GitHub.

Hello :)

This blog has been retired.

Extract images from a zip archive

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