Php plotting-external image Loading Method

This article mainly introduces how to load external images by using php plotting. It involves the use of imagecopy In the GD library. For more information, see

This article mainly introduces how to load external images by using php plotting. It involves the use of imagecopy In the GD library. For more information, see

This article describes how to load external images by using php plotting. Share it with you for your reference. The specific implementation method is as follows:

In practice, it is a common watermark function.

The Code is as follows:

<? Php
// 1. Create a canvas
$ Im = imagecreatetruecolor (300,200); // create a real-color image. The default background is black and the image identifier is returned. Another function, imagecreate, is not recommended.
// 2. Load External Images
$ Im_new = imagecreatefromjpeg ("baidu.jpg"); // returns the image identifier.
$ Im_new_info = getimagesize ("baidu.jpg"); // get the image size and return an array. This function does not need to use the gd library.
/*----
* *** 3. Copy the loaded image to the canvas.
* *** Parameter description:
$ Im: Needless to say, it refers to the canvas;
$ Im_new: source image, that is, the image loaded from the outside
(): Place the loaded image in the upper left corner of the canvas.
(0, 0): indicates the position of the loaded image. (0, 0) indicates the starting point in the upper left corner. You can also load only a part of the image.
(*, *): It is represented by *. It can be the width and height of the original image, or it can be smaller than the width and height. only part of the image is intercepted. It is used with the preceding coordinates to represent the intercepted part.
******/
Imagecopy ($ im, $ im_new, 30, 30, $ im_new_info [0], $ im_new_info [1]); // return a Boolean Value
// 3. output image
Header ("content-type: image/png ");
Imagepng ($ im); // output to the page. If the second parameter [, $ filename] exists, the image is saved.
// 4. Destroy images and release memory
Imagedestroy ($ im );
?>

I hope this article will help you with php programming.