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This article will explain in detail how to achieve text watermarking and picture watermarking in php. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

Text watermarking

Text watermarking is to add text to the picture, mainly using the imagefttext method of the gd library, and requires a font file. The effect picture is as follows:

The implementation code is as follows:

$dst_path = 'dst.jpg'

/ / create an instance of an image

$dst = imagecreatefromstring (file_get_contents ($dst_path))

/ / type in the text

$font ='. / simsun.ttc';// font

$black = imagecolorallocate ($dst, 0x00, 0x00, 0x00); / / font color

Imagefttext ($dst, 13, 0, 20, 20, $black, $font, Happy programming)

/ / output pictures

List ($dst_w, $dst_h, $dst_type) = getimagesize ($dst_path)

Switch ($dst_type) {

Case 1://GIF

Header ('Content-Type: image/gif')

Imagegif ($dst)

Break

Case 2://JPG

Header ('Content-Type: image/jpeg')

Imagejpeg ($dst)

Break

Case 3://PNG

Header ('Content-Type: image/png')

Imagepng ($dst)

Break

Default:

Break

}

Imagedestroy ($dst)

Image watermark

Image watermarking is to add a picture to another picture, mainly using imagecopy and imagecopymerge of the gd library. The effect picture is as follows:

The implementation code is as follows:

$dst_path = 'dst.jpg'

$src_path = 'src.jpg'

/ / create an instance of an image

$dst = imagecreatefromstring (file_get_contents ($dst_path))

$src = imagecreatefromstring (file_get_contents ($src_path))

/ / get the width and height of the watermark image

List ($src_w, $src_h) = getimagesize ($src_path)

/ / copy the watermark image to the target image. The last parameter 50 is to set the transparency. The translucent effect is achieved here.

Imagecopymerge ($dst, $src, 10, 10, 0, 0, $src_w, $src_h, 50)

/ / if the watermark image itself has a transparent color, use the imagecopy method

/ / imagecopy ($dst, $src, 10, 10, 0, 0, $src_w, $src_h)

/ / output pictures

List ($dst_w, $dst_h, $dst_type) = getimagesize ($dst_path)

Switch ($dst_type) {

Case 1://GIF

Header ('Content-Type: image/gif')

Imagegif ($dst)

Break

Case 2://JPG

Header ('Content-Type: image/jpeg')

Imagejpeg ($dst)

Break

Case 3://PNG

Header ('Content-Type: image/png')

Imagepng ($dst)

Break

Default:

Break

}

Imagedestroy ($dst)

Imagedestroy ($src)

This is the end of the article on "how to achieve text watermarking and picture watermarking in php". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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