Home Backend Development PHP Tutorial PHP image cropping and scaling functions_PHP tutorial

PHP image cropping and scaling functions_PHP tutorial

Jul 13, 2016 am 10:36 AM
php function picture Zoom Crop

According to the customized height and width of the target image, crop and scale the source image according to the aspect ratio of the target image.


Incoming parameters:
$source_path string source image path
$target_width integer target image width
$target_height integer Target image height

Source image supports 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 < $target_ratio)
	{
		$cropped_width  = $source_height / $target_ratio;
		$cropped_height = $source_height;
		$source_x = ($source_width - $cropped_width) / 2;
		$source_y = 0;
	}
	// 源图适中
	else
	{
		$cropped_width  = $source_width;
		$cropped_height = $source_height;
		$source_x = 0;
		$source_y = 0;
	}

	switch ($source_mime)
	{
		case 'image/gif':
			$source_image = imagecreatefromgif($source_path);
			break;

		case 'image/jpeg':
			$source_image = imagecreatefromjpeg($source_path);
			break;

		case 'image/png':
			$source_image = imagecreatefrompng($source_path);
			break;

		default:
			return false;
			break;
	}

	$target_image  = imagecreatetruecolor($target_width, $target_height);
	$cropped_image = imagecreatetruecolor($cropped_width, $cropped_height);

	// 裁剪
	imagecopy($cropped_image, $source_image, 0, 0, $source_x, $source_y, $cropped_width, $cropped_height); 
	// 缩放
	imagecopyresampled($target_image, $cropped_image, 0, 0, 0, 0, $target_width, $target_height, $cropped_width, $cropped_height);

	header('Content-Type: image/jpeg');
	imagejpeg($target_image);
	imagedestroy($source_image);
	imagedestroy($target_image);
	imagedestroy($cropped_image);
}
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www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/739133.htmlTechArticleCrop and scale the source image according to the height and width of the target image according to the customized height and width of the target image. Input parameters : $source_pathstring source image path $target_widthinteger target image width $target_heightinteger item...
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