Phpgd library for server-side image cropping and thumbnails

Phpgd library for server-side image cropping and thumbnails

For example, image cropping in php mainly uses the imagecopyresampled method of the gd Library. Image cropping example: The final cropped image: In the dotted box, the cropped image is saved as a 100-width image. Code: $ Src_path = '1.jpg '; // Create an instance of the source image $ Src = imagecreatefromstring (file_get_contents ($ src_path )); // Crop the coordinates of the points in the upper left corner of the area. $ X = 100; $ Y = 12; // Width and height of the cropping area $ Width = 200; $ Height = 200; // The image is saved to the width and height of the image, and the source-to-source ratio. Otherwise, the image will be deformed. $ Final_width = 100; $ Final_height = round ($ final_width * $ height/$ width ); // Copy the cropping area to the new image and scale or pull the image up or down based on the width and height of the source and target. $ New_image = imagecreatetruecolor ($ final_width, $ final_height ); Imagecopyresampled ($ new_image, $ src, 0, 0, $ x, $ y, $ final_width, $ final_height, $ width, $ height ); // Output image Header ('content-Type: image/jpeg '); Imagejpeg ($ new_image ); Imagedestroy ($ src ); Imagedestroy ($ new_image ); In fact, if the coordinates are (0, 0), the width and height of the cropping area are the same as those of the source image, then the thumbnail is generated. In summary, only examples of php cropping images are listed, which are server-side functions. If the client needs it, we recommend a jquery plug-in imageAreaSelect with excellent compatibility.