gd2resize script

[zohab]

Hi,

 

In my project user has facility to upload images.

 

There is no validation or condition on image size.

 

i need script to resize user image to most suitable size automatically.

 

 

[Alex]

Here's a useful class I wrote:

 

class Image
{
private $image, $ext, $file;

const CENTER = 0, CENTER_LEFT = 1, CENTER_RIGHT = 2, TOP_CENTER = 3, TOP_LEFT = 4, TOP_RIGHT = 5, BOTTOM_CENTER = 6, BOTTOM_LEFT = 7, BOTTOM_RIGHT = 8;

public function __construct($im=NULL)
{	
	if(empty($im)) return true;
	$info = @getimagesize($im);
	$backtrace = debug_backtrace();
	if(!$info)
		return die('<b>Fatal error:</b> \'' . $im . '\' is not a valid image resource on <b>line ' . $backtrace[0]['line'] . ' [' . $backtrace[0]['file'] . ']</b>');
	$ex = explode('/', $info['mime']);
	$this->ext = $ex[1];
	$func = 'imagecreatefrom' . $this->ext;
	$this->image = @$func($im);
	$this->file = $im;
	return true;
}
public function setImage($im)
{
	$info = @getimagesize($this->file);
	$backtrace = debug_backtrace();
	if(!$info)
		return die('<b>Fatal error:</b> \'' . $im . '\' is not a valid image resource on <b>line ' . $backtrace[0]['line'] . ' [' . $backtrace[0]['file'] . ']</b>');
	$ex = explode('/', $info['mime']);
	$this->ext = $ex[1];
	$func = 'imagecreatefrom' . $this->ext;
	$this->image = @$func($im);
	$this->file = $im;
	return true;
}
public function resize($width, $height, $porportional=FALSE, $percent=NULL, $max=NULL)
{
	$backtrace = debug_backtrace();
	if(empty($this->image)) return die('<b>Fatal error:</b> Invalid call to Image()->resize, no image is set on <b>line ' . $backtrace[0]['line'] . ' [' . $backtrace[0]['file'] . ']</b>');
	$info = Array(imagesx($this->image), imagesy($this->image));
	if($porportional)
	{
		if(empty($max) && empty($percent)) return false;
		if(empty($max))
		{
			$new_width = $info[0] * ($percent/100);
			$new_height = $info[1] * ($percent/100);
		}
		else
		{
			if($info[0] < $max && $info[1] < $max) return false;
			$new_width = ($info[0] > $info[1]) ? $max : ($info[0]/$info[1]) * $max;
			$new_height = ($info[0] > $info[1]) ? ($info[1]/$info[0]) * $max : $max;
		}
	}
	else
	{
		$new_width = $width;
		$new_height = $height;
	}
	$new_image = imagecreatetruecolor($new_width, $new_height);
	imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $new_width, $new_height, $info[0], $info[1]);
	$this->image = $new_image;
	return true;
}
public function crop($width, $height, $x, $y, $position=NULL)
{
	$backtrace = debug_backtrace();
	if(empty($this->image)) return die('<b>Fatal error:</b> Invalid call to Image()->crop, no image is set on <b>line ' . $backtrace[0]['line'] . ' [' . $backtrace[0]['file'] . ']</b>');
	$info = Array(imagesx($this->image), imagesy($this->image));
	if($width > $info[0] || $height > $info[1]) return false;
	if(!empty($position) && $position >= 0 && $position <= 
	{
		switch($position)
		{
			case CENTER:
				$x = ($info[0] - $width)/2;
				$y = ($info[1] - $height)/2;
			break;
			case CENTER_LEFT:
				$x = 0;
				$y = ($info[1] - $height)/2;
			break;
			case CENTER_RIGHT:
				$x = ($info[0] - $height);
				$y = ($info[1] - $height)/2;
			break;
			case TOP_CENTER:
				$x = ($info[0] - $width)/2;
				$y = 0;
			break;
			case TOP_LEFT:
				$x = 0;
				$y = 0;
			break;
			case TOP_RIGHT:
				$x = ($info[0] - $width);
				$y = 0;
			break;
			case BOTTOM_CENTER:
				$x = ($info[0] - $width)/2;
				$y = ($info[1] - $height);
			break;
			case BOTTOM_LEFT:
				$x = 0;
				$y = ($info[1] - $height);
			break;
			case BOTTOM_RIGHT:
				$x = ($info[0] - $width);
				$y = ($info[1] - $height);
			break;
			default:
				return false;
			break;
		}
	}
	$new_image = imagecreatetruecolor($width, $height);
	imagecopyresampled($new_image, $this->image, 0, 0, $x, $y, $width, $height, $width, $height);
	$this->image = $new_image;
	return true;
}
public function save($loc, $compression=100)
{
	$backtrace = debug_backtrace();
	if(empty($this->image)) return die('<b>Fatal error:</b> Invalid call to Image()->save, no image is set on <b>line ' . $backtrace[0]['line'] . ' [' . $backtrace[0]['file'] . ']</b>');
	$func = 'image' . $this->ext;
	return $func($this->image, $loc, $compression);
}
public function output()
{
	$backtrace = debug_backtrace();
	if(empty($this->image)) return die('<b>Fatal error:</b> Invalid call to Image()->output, no image is set on <b>line ' . $backtrace[0]['line'] . ' [' . $backtrace[0]['file'] . ']</b>');
	header('Content-type: image/' . $this->ext);
	$func = 'image' . $this->ext;
	$func($this->image);
}
}

 

My class can do a lot of different things, so you'd need to be specific for me to help you on exactly what you need to image to be resized to (proportional, max width, max height, whatever..). Unless you can look at the resize function and figure it out yourself.

 

Here's an example of something you can do:

 

//include my class
$image = new Image($_FILES['file']['tmp_name']);// $_FILES['file']['tmp_name'] is the file being uploaded
$image->resize(width, height);
$image->save('path/to/save/location');