17.Sep.2008 at 17 | sam
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>
| Download: | thumbnailer.zip |
|---|---|
| Version: | 1.0 |
| Updated: | October 30, 2008 |
| Size: | 5.18 KB |
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