Php implements the text and image watermark techniques for uploading images,

Php implements the text and image watermark techniques for uploading images,

The functions implemented in this article are especially suitable for some malls and image sites. They share the skills of adding text and image watermarks when uploading images for your reference. The specific content is as follows:

1. water. class. php

<? Phpheader ('content-Type: text/html; charset = UTF-8 ');/** To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. * /// Add the watermark Class Water to the image {// enable the watermark private $ watermark_on = '1'; public $ water_img; // The watermark position public $ pos = 1; // compression ratio public $ pct = 80; // transparency public $ quality = 80; public $ text = 'fun Network zlblog.sinaapp.com '; public $ size = 12; public $ color =' #000000 '; public $ font = 'font. ttf'; public function watermark ($ img, $ pos = '', $ out_img ='', $ water_img = '', $ text ='') {if (! $ This-> check ($ img) |! $ This-> watermark_on) return false; $ water_img = $ water_img? $ Water_img: $ this-> water_img; // watermark enabling Status $ waterimg_on = $ this-> check ($ water_img )? 1: 0; // determine whether to operate on the source image $ out_img = $ out_img? $ Out_img: $ img; // determine the watermark position $ pos = $ pos? $ Pos: $ this-> pos; // watermark text $ text = $ text? $ Text: $ this-> text; $ img_info = getimagesize ($ img); $ img_w = $ img_info [0]; $ img_h = $ img_info [1]; // determine the watermark image type if ($ waterimg_on) {$ w_info = getimagesize ($ water_img); $ w_w = $ w_info [0]; $ w_h = $ w_info [1]; if ($ img_w <$ w_w | $ img_h <$ w_h) return false; switch ($ w_info [2]) {case 1: $ w_img = imagecreatefromgif ($ water_img ); break; case 2: $ w_img = imagecreatefromjpeg ($ water_img); break; case 3: $ W_img = imagecreatefrompng ($ water_img); break ;}} else {if (empty ($ text) | strlen ($ this-> color )! = 7) return FALSE; $ text_info = imagettfbbox ($ this-> size, 0, $ this-> font, $ text ); $ w_w = $ text_info [2]-$ text_info [6]; $ w_h = $ text_info [3]-$ text_info [7];} // create the source image resource switch ($ img_info [2]) {case 1: $ res_img = imagecreatefromgif ($ img); break; case 2: $ res_img = imagecreatefromjpeg ($ img ); break; case 3: $ res_img = imagecreatefrompng ($ img); break;} // determine the watermark Position switch ($ pos) {case 1: $ x = $ y = 25; break; case 2: $ x = ($ img_w-$ w_w)/2; $ y = 25; break; case 3: $ x = $ img_w-$ w_w; $ y = 25; break; case 4: $ x = 25; $ y = ($ img_h-$ w_h)/2; break; case 5: $ x = ($ img_w-$ w_w)/2; $ y = ($ img_h-$ w_h)/2; break; case 6: $ x = $ img_w-$ w_w; $ y = ($ img_h-$ w_h)/2; break; case 7: $ x = 25; $ y = $ img_h-$ w_h; break; case 8: $ x = ($ img_w-$ w_w)/2; $ y = $ img_h-$ w_h; break; case 9: $ x = $ img_w-$ w_w; $ y = $ img_h-$ w_h; break; default: $ x = mt_rand (25, $ img_w-$ w_w); $ y = mt_rand (25, $ img_h-$ w_h);} // write image resources if ($ waterimg_on) {imagecopymerge ($ res_img, $ w_img, $ x, $ y, 0, 0, $ w_w, $ w_h, $ this-> pct);} else {$ r = hexdec (substr ($ this-> color, 1, 2 )); $ g = hexdec (substr ($ this-> color, 3, 2); $ B = hexdec (substr ($ this-> color, 5, 2 )); $ color = imagecolorallocate ($ res_img, $ r, $ g, $ B); imagettftext ($ res_img, $ this-> size, 0, $ x, $ y, $ color, $ this-> font, $ text);} // generate an image type switch ($ img_info [2]) {case 1: imagecreatefromgif ($ res_img, $ out_img); break; case 2: // imagecreatefromjpeg ($ res_img, $ out_img); imagejpeg ($ res_img, $ out_img); break; case 3: imagejpeg ($ res_img, $ out_img); break ;} if (isset ($ res_img) imagedestroy ($ res_img); if (isset ($ w_img) imagedestroy ($ w_img); return TRUE ;} // verify whether the image has private function check ($ img) {$ type = array('.jpg', '.hangzhou', '.png', '.gif '); $ img_type = strtolower (strrchr ($ img ,'. '); return extension_loaded ('gd') & file_exists ($ img) & in_array ($ img_type, $ type );}}

2. test1.php

<?php /*  * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. *///header('Content-Type:text/html;charset=utf-8');include 'water.class.php';$image = new Water();$image->watermark('12.jpg',5);//$image->watermark('12.jpg',1);

3.

The above is all the content of this article. I hope it will help you learn PHP programming.