PHP图片裁剪、缩放函数

根据自定义的目标图高宽, 按目标图高宽比裁剪、缩放源图.


传入参数:
$source_path string 源图路径
$target_width integer 目标图宽度
$target_height integer 目标图高度

源图支持MIMETYPE: image/gif, image/jpeg, image/png.

function imagecropper($source_path, $target_width, $target_height)
{
	$source_info   = getimagesize($source_path);
	$source_width  = $source_info[0];
	$source_height = $source_info[1];
	$source_mime   = $source_info['mime'];
	$source_ratio  = $source_height / $source_width;
	$target_ratio  = $target_height / $target_width;

	// 源图过高
	if ($source_ratio > $target_ratio)
	{
		$cropped_width  = $source_width;
		$cropped_height = $source_width * $target_ratio;
		$source_x = 0;
		$source_y = ($source_height - $cropped_height) / 2;
	}
	// 源图过宽
	elseif ($source_ratio