README

PNGMetadata is a library which is able to extract the metadata of an image in png format.

It is important to mention that PNGMetadata does not use the software ExifTool so it is completely native.

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Requirements

• PHP >= 7.4
• XML PHP Extension
• JSON PHP Extension
• GD PHP Extension
• EXIF PHP Extension

Installation

Use the package manager Composer to install PNGMetadata.

$ composer require joserick/png-metadata

Use

Getting a PNGMetadata Instance

// include composer autoload
require 'vendor/autoload.php';

// import the Joserick PNGMetadata
use PNGMetadata\PNGMetadata;

// build PNGMetadata object with a image path.
$png_metadata = new PNGMetadata('Photo.png'); // return a 'ArrayObject' or 'Exception'

In case you don't want to see any errors (Exception) generated you can used the static function 'extract()' which returns a 'false' in case of error.

$png_metadata = PNGMetadata::extract('Photo.png'); // return a 'ArrayObject' or 'False'

If you want work with simple array without any other function you can call to 'toArray()'.

$png_metadata = new PNGMetadata('Photo.png');
$metadata_array = $png_metadata->toArray(); // return simple 'Array'
//or
$metadata_array = PNGMetadata::extract('Photo.png')->toArray(); // return simple 'Array'

Examples

Example 1 - All

Print all the metadata.

$png_metadata = new PNGMetadata('../Photo.png');
echo $png_metadata; // Print metadata in 2 colums.

Out:

Example 2 - Get Metadata

Get specific metadata.

$png_metadata = new PNGMetadata(___DIR___.'/Photo.png');
echo $png_metadata->get('exif:DateTime'); // Return a value, a array or false.

Example 3 - Types

Print the metadata types (IHDR, sRGB, BKGD, EXIF, XMP, CRS, DATE, DC, ICC, AUX, ...).

$png_metadata = new PNGMetadata('./Path/Photo.png');
// or
$png_metadata = PNGMetadata::extract('./Path/Photo.png');

foreach($png_metadata as $key => $value){
	echo $key . "<br>"; // Metadata types
}

Extras Functions

Get the thumbnail stored in the metadata!

$png_metadata = new PNGMetadata('../Photo.png');
// or
$png_metadata = PNGMetadata::extract('../Photo.png');

$thumb = $png_metadata->getThumbnail();

if ($thumb !== false) {
	header('Content-Type: image/png');
	imagepng($thumb);
	imagedestroy($thumb);
}

Is PNG?

if (PNGMetadata::isPNG('./Photo_jpg.png')){
	echo 'Yes, it is a PNG.';
}else{
	echo 'No, it is not a PNG.'
}

What type?

return PNGMetadata::getType('./Photo') == 1 // GIF?

License

The GNU Public License (GPLv3). Please see License File for more information.