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Image resizer (thumbnail generator)

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If the optional parameter $crop is set to TRUE the image will be zoomed and cropped to specific size ($new_size). Else, the image will be resized to size, keeping aspect ratio and using $new_size as max size.

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  1. function image_resize($input_file, $output_file, $new_size=75, $crop=true) {
  2. 	if(!file_exists($input_file)) {
  3. 		return false;
  4. 	}
  5. 	if (function_exists('ini_set')) {
  6. 		@ini_set('memory_limit', -1);
  7. 		ini_set( 'arg_separator.output' , '&' );
  8. 	}
  9. 	if(eregi('\.jpg$|\.jpeg$', $input_file)) {
  10. 		$original = @imagecreatefromjpeg($input_file);
  11. 	} 
  12. 	elseif (eregi('\.gif$', $input_file)) {
  13. 		$original = @imagecreatefromgif($input_file);
  14. 	} 
  15. 	elseif (eregi('\.png$', $input_file)) {
  16. 		$original = @imagecreatefrompng($input_file);
  17. 	}
  18. 	else {
  19. 		return false;
  20. 	}
  21. 	if ($original) {
  22. 		if (function_exists('getimagesize')) {
  23. 			list($width, $height, $type, $attr) = getimagesize($input_file);
  24. 		} else {
  25. 			return false;
  26. 		}
  27. 		$ratio['x'] = round($width/$new_size, 2);
  28. 		$ratio['y'] = round($height/$new_size, 2);
  29. 		if($crop == true) {
  30. 			$ratio = min($ratio['x'], $ratio['y']);
  31. 		}
  32. 		else {
  33. 			$ratio = max($ratio['x'], $ratio['y']);
  34. 		}
  35. 		$smallheight = floor($height / $ratio);
  36. 		$smallwidth = floor($width / $ratio);
  37. 		if($crop == true) {
  38. 			$ofx = floor(($new_size - $smallwidth) / 2);
  39. 			$ofy = floor(($new_size - $smallheight) / 2);
  40. 		}
  41. 		else {
  42. 			$ofx = $ofy = 0;
  43. 		}
  44.  
  45. 		if (function_exists('imagecreatetruecolor')) {
  46. 			if($crop == true) {
  47. 				$small = imagecreatetruecolor($new_size, $new_size);
  48. 			} 
  49. 			else {
  50. 				$small = imagecreatetruecolor($smallwidth, $smallheight);
  51. 			}
  52. 		} else {
  53. 			if($crop == true) {
  54. 				$small = imagecreate($new_size, $new_size);
  55. 			}
  56. 			else {
  57. 				$small = imagecreate($smallwidth, $smallheight);
  58. 			}
  59. 		}
  60. 		if (function_exists('imagecopyresampled')) {
  61. 			imagecopyresampled($small, $original, $ofx, $ofy, 0, 0, $smallwidth, $smallheight, $width, $height);
  62. 		} else {
  63. 			imagecopyresized($small, $original, $ofx, $ofy, 0, 0, $smallwidth, $smallheight, $width, $height);
  64. 		}
  65. 		if(imagejpeg($small, $output_file)) {
  66. 			if(file_exists($output_file)) {
  67. 				return true;
  68. 			}
  69. 		}
  70. 		else {
  71. 			return false;
  72. 		}
  73. 	}	
  74. }

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