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HomeBackend DevelopmentPHP TutorialPHP为图片添加水印

情况一:在图片上添加字符串

<?php $im = imagecreatefromjpeg("test.jpg");//将待添加水印文件创建为画布$str = "http://www.koastal.sinaapp.com";//定义作为水印的字符串$red = imagecolorallocate($im, 0xFF, 0x00, 0x00);//创建红色画笔imagestring($im, 5, 200, 300, $str, $red);//使用红色画笔,系统的第五套字体,将字符串绘制在画布$im的宽200px,高300px处header("content-type: image/jpeg");//定义头文件imagejpeg($im);//输出图片imagedestroy($im);//释放内存占用?>

效果图:


情况二:在图片上添加另一图片(logo)

<?php $im = imagecreatefromjpeg("test.jpg");//将待添加水印文件创建为画布$logo = imagecreatefrompng("logo.png");//将logo文件创建为画布$size = getimagesize('logo.png');//获取logo文件的长和宽imagecopy($im, $logo, 350, 270, 0, 0, $size[0], $size[1]); //将logo文件(从0,0位置开始)复制到im文件(从350,270开始)中去header("content-type: image/jpeg");//定义头文件imagejpeg($im);//输出图片imagedestroy($im);//释放内存占用?>

效果图:



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