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1116 Creating TAR Archives
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You want to dynamically create a TAR archive
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Use PEAR s Archive_Tar class:
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11: Working with Different File Formats and Network Protocols
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< php // include class include "Archive/Tarphp"; // create object // specify filename for output file $tar = new Archive_Tar("wwwtar"); // recursively process directories // add to file array $iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator("files/")); foreach ($iterator as $key=>$value) { $files[] = $iterator->getPathname(); } // build archive $tar->create($files) or die("Could not create archive!"); echo "Archive created successfully"; >
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PEAR s Archive_Tar package, freely available from http://pearphpnet/ package/Archive_Tar, is particularly helpful for creating files in the Tar (Tape Archive) format To use this package, first create an instance of the Archive_Tar class (passing the name of the output TAR file to the object constructor) and then invoke the instance s create() method with an array containing a file list The object will then create a single archive containing all the listed files and save it to disk You can extract files from the archive by calling the object s extract() method, or view the contents of an existing archive with the object s listContent() method
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If you d like to create a compressed archive, Archive_Tar supports that option too, allowing you to apply GZIP or BZIP compression to the TAR archive To do this, simply add the value "gz" or "bz2" as a second argument to the Archive_Tar object constructor when instantiating it Note that your PHP build must include support for the zlib and bzip2 compression libraries for this to work
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Read a detailed tutorial on Archive_Tar at http://wwwmelonfirecom/ community/columns/trog/articlephp id=273
1117 Resizing Images
Problem
You want to dynamically resize and render an image, such as a digital photo in a Web-based image gallery
Solution
Use PHP s imagecopyresampled() function:
< php // define image to resize $file = "img1154jpg"; // create object from original image $imOrig = imagecreatefromjpeg($file); // get image dimensions list($width, $height) = getimagesize($file); // create object for new image $imNew = imagecreatetruecolor($width * 15, $height * 15); // resample and resize old image imagecopyresampled($imNew, $imOrig, 0, 0, 0, 0, $width * 15, $height * 15, $width, $height); // output resized image header("Content-type: image/jpeg"); imagejpeg($imNew); imagedestroy($im); >
11: Working with Different File Formats and Network Protocols
Comments
PHP s image manipulation toolkit contains the imagecopyresampled() function, which can be used to alter an image s dimensions and resample it for the new size This ability to dynamically resize images is particularly handy for Web-based photo galleries, which often need to display photos of varying sizes in a uniform format The previous listing illustrates the process First, an object representing the original image is created from the image file with the imagecreatefromjpeg() function, and its dimensions are calculated Next, a second object is created to represent the new resized image, and set to 150 percent of the original image size The imagecopyresampled() function then takes care of copying the original (large) image to the new (larger) image, resampling it along the way to maintain fidelity to the original version The resampled and resized image can now be transmitted to the browser with the imagejpeg() function for display
1118 Working with Image Metadata
Problem
You want to extract the descriptive information embedded in an image, such as the metadata or thumbnails placed in digital photos
Solution
Use PHP s Exchangeable Image File Format (EXIF) functions:
< php // define directory path $dir = "canon"; // scan directory for matching files // extract EXIF information from each // and display $fileList = glob("$dir/*jpg"); if (sizeof($fileList) > 0) { foreach ($fileList as $file) { $exif = exif_read_data($file, 0, true); echo "File: $file\n";
PHP Programming Solutions
foreach ($exif as $section => $data) { foreach ($data as $key => $value) { echo "$section -> $key = $value\n"; } } echo "\n"; } } >
Comments
EXIF is a standard for storing descriptive metadata in image files, particularly JPEG and TIFF files The format is commonly used by digital camera vendors to embed descriptive information in the headers of digital photos PHP s exif_read_data() function can read these headers and extract the information stored within them The previous listing illustrates the process A common application of PHP s EXIF support involves extracting an image thumbnail from the EXIF metadata in a digital photo, and using this thumbnail in a Web-based image gallery to preview the actual image This can be easily accomplished with the exif_thumbnail() function, illustrated here:
< php // define directory path $dir = "canon"; // // // if if file name is provided read image thumbnail from file send to browser for display ($_GET['file']) { $file = $_GET['file']; $image = exif_thumbnail("$dir/$file"); if ($image !== false) { header("Content-type: image/jpeg"); echo $image; } // if no file name is provided // scan directory and list all matching files // with thumbnails } else { $fileList = glob("$dir/*jpg"); if (sizeof($fileList) > 0) {
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