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PHP Image Ratio Width & Height, Top & Left

/ Published in: PHP
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Returns array with information like:
Input image
width 200
height 200

print_r(ratioResize('path/to/image.ext' , 100 , 50));



output:


array(
[ratio] => .5,
[height] => 50,
[width] => 50,
[left] => 25,
[top] => 25
);

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  1. function ratioResize( $image , $maxwidth , $maxheight , $forcewidth=false ){
  2. 		$return = array();list( $w , $h ) = getimagesize( $image );
  3. 		if($w < $maxwidth && $h < $maxheight && !$forcewidth)return array('width'=>$w,'height'=>$h,'left'=>($maxwidth-$w)/2,'top'=>($maxheight-$h)/2,'ratio'=>1);
  4. 		$rw = $maxwidth/$w;	$rh = $maxheight/$h; //GET HEIGHT AND WIDTH RATIO 
  5. 		$return['ratio'] = $rw <= $rh?$rw:$rh;
  6. 		$return['height'] = round($h*($return['ratio']));
  7. 		$return['width'] =  round($w*($return['ratio'])); //GET CALCULATED DIMENSIONS FROM RATIO
  8. 		$return['left'] = ($maxwidth - $return['width'])/2;
  9. 		$return['top'] =  ($maxheight - $return['height'])/2;//GET CALCULATED CENTERING PIXELS
  10. 		return $return;
  11. 	}

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