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php Writing text on a picture is equivalent to adding a text watermark to the picture. Generally, when uploading a picture, the watermark is usually a text or picture logo watermark. Let’s take a look at the two adding methods. .
1. Text watermark
Text watermark is to add text to the picture. It mainly uses the imagefttext method of the gd library and requires a font file.
$dst_path = 'dst.jpg'; //创建图片的实例 $dst = imagecreatefromstring(file_get_contents($dst_path)); //打上文字 $font = './simsun.ttc';//字体路径 $black = imagecolorallocate($dst, 0x00, 0x00, 0x00);//字体颜色 imagefttext($dst, 13, 0, 20, 20, $black, $font, '快乐编程'); //输出图片 list($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);
Create a new picture, and then print the text watermark:
// imagecreatefromstring // imageCreateFromPng Create a new image from file or URL 创建图片对象 // Create a 300x100 image,新创建一张图片 $im = imagecreatetruecolor(500, 300); // set color $red = imagecolorallocate($im, 0xFF, 0x00, 0x00); $black = imagecolorallocate($im, 0x00, 0x00, 0x00); // Make the background red // function imagefilledrectangle ($image, $x1, $y1, $x2, $y2, $color) {} imagefilledrectangle($im, 0, 0, 300, 100, $red); // Path to our ttf font file $font_file = './font/Arial.ttf'; // imagefttext ($image, $size, $angle, $x, $y, $color, $fontfile, $text, $extrainfo = null ) // Draw the text 'PHP Manual' using font size 13 imagefttext($im, 13, 0, 150, 50, $black, $font_file, 'PHP Manual'); // Output image to the browser header('Content-Type: image/png'); imagepng($im); imagedestroy($im); clipboard.png
The rendering is as follows:
2. Picture Watermark
Picture watermark is to add one picture to another picture, mainly using the imagecopy and imagecopymerge of the gd library.
$dst_path = 'myimage.jpg'; $src_path = 'http://www.logodashi.com/FileUpLoad/inspiration/636003768803214440.jpg'; //创建图片的实例 $dst = imagecreatefromstring(file_get_contents($dst_path)); $src = imagecreatefromstring(file_get_contents($src_path)); //获取水印图片的宽高 list($src_w, $src_h) = getimagesize($src_path); //将水印图片复制到目标图片上,最后个参数50是设置透明度,这里实现半透明效果 imagecopymerge($dst, $src, 10, 10, 0, 0, $src_w, $src_h, 30); //如果水印图片本身带透明色,则使用imagecopy方法 // imagecopy($dst, $src, 10, 10, 0, 0, $src_w, $src_h); //输出图片 list($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);
Rendering:
3. Other functions related to image processing
/* *返回图像的大小及图像类型 // Get the size of an image $size = getimagesize("http://image18-c.poco.cn/mypoco/myphoto/20160901/20/17857099520160901203311082.jpg?750x956_120"); print_r($size); // 打印结果 Array ( [0] => 750 [1] => 956 [2] => 2 [3] => width="750" height="956" [bits] => 8 [channels] => 3 [mime] => image/jpeg ) */ /** * imagecopy — 拷贝图像的一部分 */ // bool imagecopy ( resource $dst_im , resource $src_im , int $dst_x , int $dst_y , int $src_x , int $src_y , int $src_w , int $src_h ) // 将 src_im 图像中坐标从 src_x,src_y 开始,宽度为 src_w,高度为 src_h 的一部分拷贝到 dst_im 图像中坐标为 dst_x 和 dst_y 的位置上。 /* * * http://php.net/manual/zh/function.imagecopymerge.php *imagecopymerge — 拷贝并合并图像的一部分 *bool imagecopymerge ( resource $dst_im , resource $src_im , int $dst_x , int $dst_y , int $src_x , int $src_y , int $src_w , int $src_h , int $pct ) * * */
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