Code Examples -> PHP Image Class

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PHP Code Examples

Title :	PHP Image Class
Categories :	PHP, PHP Classes, Multimedia, GD image library	Alix Axel
Date :	Jun 19th 2008
Grade :	3 of 5 (graded 5 times)
Viewed :	8140
File :	No file for this code example.
Images :	No Images for this code example.

Search :	More code by Alix Axel
Action :	Grade This Code Example
Tools :	My Examples List

Code


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This class uses the GD library to do standard image operations like resizing, convert image type, fetch image dimensions and so on. Works with PNG, JPG and GIF image types.

<?php

class Image
{
private $gd_info = array();
private $im = false;
private $info = array();

function Convert($type = 'jpg', $quality = null, $destination_folder = '.')
{
if (is_resource($this->im))
{
return $this->Transform($this->info['width'], $this->info['height'], $type, $quality, $destination_folder);
}

return false;
}

function GD_Info($flag = null)
{
if (extension_loaded('gd'))
{
$result = array();

if (empty($this->gd_info))
{
$this->gd_info = gd_info();

$this->gd_info['GD Bundled'] = true;

if (strpos(strtolower($this->gd_info['GD Version']), 'bundled') === false)
{
$this->gd_info['GD Bundled'] = false;
}

preg_match('([\d\.]+)', $this->gd_info['GD Version'], $match);

$this->gd_info['GD Version'] = $match[0];
}

if (!empty($flag))
{
if (array_key_exists($flag, $this->gd_info))
{
$result = $this->gd_info[$flag];
}

else
{
$result = false;
}
}

return $result;
}

return false;
}

function Info($flag = null, $image = null)
{
if (!empty($image))
{
if (is_file($image))
{
$image_info = getimagesize($image);

if ($image_info !== false)
{
$result = array();

list($result['width'], $result['height'], $result['type']) = $image_info;

$image_types = array('gif', 'jpg', 'png', 'swf', 'psd', 'bmp', 'tif', 'tif', 'jpc', 'jp2', 'jpx', 'jb2', 'swc', 'iff', 'wbmp', 'xbm');

if (($result['type'] >= 1) && ($result['type'] <= 16))
{
$result['type'] = $image_types[$result['type'] - 1];
}

if (!empty($flag))
{
if (array_key_exists($flag, $result))
{
$result = $result[$flag];
}

else
{
$result = false;
}
}

return $result;
}
}

return false;
}

if (is_resource($this->im))
{
$result = $this->info;

if (!empty($flag))
{
if (array_key_exists($flag, $this->info))
{
$result = $this->info[$flag];
}

else
{
$result = false;
}
}

return $result;
}

return false;
}

function Open($image)
{
if (!extension_loaded('gd'))
{
return false;
}

if (is_resource($this->im))
{
imagedestroy($this->im);
}

$this->im = false;
$this->info = array();

if (is_file($image))
{
$image_info = getimagesize($image);

if ($image_info !== false)
{
list($this->info['width'], $this->info['height'], $this->info['type']) = $image_info;

$image_types = array('gif', 'jpg', 'png', 'swf', 'psd', 'bmp', 'tif', 'tif', 'jpc', 'jp2', 'jpx', 'jb2', 'swc', 'iff', 'wbmp', 'xbm');

if (($this->info['type'] >= 1) && ($this->info['type'] <= 16))
{
$this->info['type'] = $image_types[$this->info['type'] - 1];
}

$this->info['hash'] = sha1_file($image);

if ($this->info['type'] == 'gif')
{
$this->im = imagecreatefromgif($image);
}

else if ($this->info['type'] == 'jpg')
{
$this->im = imagecreatefromjpeg($image);
}

else if ($this->info['type'] == 'png')
{
$this->im = imagecreatefrompng($image);

/*$transparent = imagecolorallocate($this->im, 255, 255, 255);
imagefill($this->im, 0, 0, $transparent);
imagecolortransparent($this->im, $transparent);*/

###################################

echo imagecolortransparent($this->im);
}

if (!is_resource($this->im))
{
$this->im = false;
$this->info = array();
}
}
}

return $this;
}

function Path($path)
{
if (file_exists($path))
{
$path = str_replace('\\', '/', realpath($path));

if (is_dir($path))
{
$path .= '/';
}

return $path;
}

return false;
}

function Resize($width = null, $height = null, $quality = null, $destination_folder = '.')
{
if (is_resource($this->im))
{
return $this->Transform($width, $height, $this->info['type'], $quality, $destination_folder);
}

return false;
}

function Transform($width = null, $height = null, $type = null, $quality = null, $destination_folder = '.')
{
if (is_resource($this->im))
{
if (!in_array($this->info['type'], array('gif', 'jpg', 'png')))
{
return false;
}

$width = intval($width);
$height = intval($height);

if ((empty($width)) && (empty($height)))
{
return false;
}

if (empty($width))
{
$width = round($height * $this->info['width'] / $this->info['height']);
}

if (empty($height))
{
$height = round($width * $this->info['height'] / $this->info['width']);
}

$type = strtolower($type);

if ((empty($type)) || (!in_array($type, array('gif', 'jpg', 'png'))))
{
$type = $this->info['type'];
}

if (is_null($quality))
{
$quality = 100;
}

$quality = intval($quality);

if ($type == 'jpg')
{
if (($quality < 0) || ($quality > 100))
{
$quality = 100;
}
}

else
{
$quality = 100;
}

$destination_folder = $this->Path($destination_folder);

if (!is_dir($destination_folder))
{
return false;
}

$destination_image = sha1($this->info['hash'] . $width . $height . $quality) . '.' . $type;

if (file_exists($destination_folder . $destination_image))
{
return $destination_image;
}

if (version_compare($this->GD_Info('GD Version'), '2.0.28', '>='))
{
$image = imagecreatetruecolor($width, $height);

if ($this->GD_Info('GD Bundled') === true)
{
imageantialias($image, true);
}

imagecopyresampled($image, $this->im, 0, 0, 0, 0, $width, $height, $this->info['width'], $this->info['height']);
}

else
{
$image = imagecreate($width, $height);

if ($this->GD_Info('GD Bundled') === true)
{
imageantialias($image, true);
}

imagecopyresized($image, $this->im, 0, 0, 0, 0, $width, $height, $this->info['width'], $this->info['height']);
}

if ($type == 'gif')
{
if (imagegif($image, $destination_folder . $destination_image) !== false)
{
imagedestroy($image);

return $destination_image;
}
}

else if ($type == 'jpg')
{
imageinterlace($image, true);

if (imagejpeg($image, $destination_folder . $destination_image, $quality) !== false)
{
imagedestroy($image);

return $destination_image;
}
}

else if ($type == 'png')
{
if (imagepng($image, $destination_folder . $destination_image) !== false)
{
imagedestroy($image);

return $destination_image;
}
}

return false;
}

return false;
}
}

?>

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User Comments

	Joshua Walcher wrote : 1784 `If you're going to add a class again, would you add usage examples as comments in your code? Unless, of course, you're just using this site as a depository for your own code and don't care about other users using the code. If that's the case, no worries!`
	Alix Axel wrote : 1785 It seems pretty straightforward to me, however for the sake of a few examples here they are: <?php $Image = new Image(); // Convert an image: $Image->Open('/path/to/image.jpg')->Convert('png'); // Resize an image (proportional height): $Image->Open('/path/to/image.jpg')->Resize(400); // Resize an image (proportional width): $Image->Open('/path/to/image.jpg')->Resize(null, 400); // Resize an image (forced width and height): $Image->Open('/path/to/image.jpg')->Resize(400, 400); ?>
	Joshua Walcher wrote : 1787 `Thanks!`
	m d wrote : 1789 `Those examples work out pretty cool, except this: "f97faa4505727aebb7323ad2dc5b5a72879aae89" Image name:"image.jpg" $Image->Open('image.jpg')->Convert('png'); afterwards: "f97faa4505727aebb7323ad2dc5b5a72879aae89.png" How to retain the filename or rather just append it with a "_" like this "image_.png" Cheers`
	Alix Axel wrote :1791 `Hi, to do that you must change the following code: <?php // On the Open() method change this: $this->info['hash'] = sha1_file($image); // to: $this->info['hash'] = pathinfo($image, PATHINFO_FILENAME) . '_'; // On the Transform() method change this: $destination_image = sha1($this->info['hash'] . $width . $height . $quality) . '.' . $type; // to: $destination_image = $this->info['hash'] . '.' . $type; ?> I haven't tested but it should work.`