1: 面向过程的编写方法
//指定图片路径 $src = '001.png'; //获取图片信息 $info = getimagesize($src); //获取图片扩展名 $type = image_type_to_extension($info[2],false); //动态的把图片导入内存中 $fun = "imagecreatefrom{$type}"; $image = $fun('001.png'); //指定字体颜色 $col = imagecolorallocatealpha($image,255,255,255,50); //指定字体内容 $content = 'helloworld'; //给图片添加文字 imagestring($image,5,20,30,$content,$col); //指定输入类型 header('Content-type:'.$info['mime']); //动态的输出图片到浏览器中 $func = "image{$type}"; $func($image); //销毁图片 imagedestroy($image);
2:面向对象的实现方法
class Image_class { private $image; private $info; /** * @param $src:图片路径 * 加载图片到内存中 */ function __construct($src){ $info = getimagesize($src); $type = image_type_to_extension($info[2],false); $this -> info =$info; $this->info['type'] = $type; $fun = "imagecreatefrom" .$type; $this -> image = $fun($src); } /** * @param $fontsize: 字体大小 * @param $x: 字体在图片中的x位置 * @param $y: 字体在图片中的y位置 * @param $color: 字体的颜色是一个包含rgba的数组 * @param $text: 想要添加的内容 * 操作内存中的图片,给图片添加文字水印 */ public function fontMark($fontsize,$x,$y,$color,$text){ $col = imagecolorallocatealpha($this->image,$color[0],$color[1],$color[2],$color[3]); imagestring($this->image,$fontsize,$x,$y,$text,$col); } /* * 输出图片到浏览器中 */ public function show(){ header('content-type:' . $this -> info['mime']); $fun='image' . $this->info['type']; $fun($this->image); } /** * 销毁图片 */ function __destruct(){ imagedestroy($this->image); } } //对类的调用 $obj = new Image_class('001.png'); $obj->fontMark(20,20,30,array(255,255,255,60),'hello'); $obj->show();
3.支持以图片和文字两种方式给图片添加水印。图片支持GIF,PNG,JPG三种格式,水印图片支持PNG和GIF
function setWater($imgSrc,$markImg,$markText,$TextColor,$markPos,$fontType,$markType) { $srcInfo = @getimagesize($imgSrc); $srcImg_w = $srcInfo[0]; $srcImg_h = $srcInfo[1]; switch ($srcInfo[2]) { case 1: $srcim =imagecreatefromgif($imgSrc); break; case 2: $srcim =imagecreatefromjpeg($imgSrc); break; case 3: $srcim =imagecreatefrompng($imgSrc); break; default: die("不支持的图片文件类型"); exit; } if(!strcmp($markType,"img")) { if(!file_exists($markImg) || empty($markImg)) { return; } $markImgInfo = @getimagesize($markImg); $markImg_w = $markImgInfo[0]; $markImg_h = $markImgInfo[1]; if($srcImg_w < $markImg_w || $srcImg_h < $markImg_h) { return; } switch ($markImgInfo[2]) { case 1: $markim =imagecreatefromgif($markImg); break; case 2: $markim =imagecreatefromjpeg($markImg); break; case 3: $markim =imagecreatefrompng($markImg); break; default: die("不支持的水印图片文件类型"); exit; } $logow = $markImg_w; $logoh = $markImg_h; } if(!strcmp($markType,"text")) { $fontSize = 16; if(!empty($markText)) { if(!file_exists($fontType)) { return; } } else { return; } $box = @imagettfbbox($fontSize, 0, $fontType,$markText); $logow = max($box[2], $box[4]) - min($box[0], $box[6]); $logoh = max($box[1], $box[3]) - min($box[5], $box[7]); } if($markPos == 0) { $markPos = rand(1, 9); } switch($markPos) { case 1: $x = +5; $y = +5; break; case 2: $x = ($srcImg_w - $logow) / 2; $y = +5; break; case 3: $x = $srcImg_w - $logow - 5; $y = +15; break; case 4: $x = +5; $y = ($srcImg_h - $logoh) / 2; break; case 5: $x = ($srcImg_w - $logow) / 2; $y = ($srcImg_h - $logoh) / 2; break; case 6: $x = $srcImg_w - $logow - 5; $y = ($srcImg_h - $logoh) / 2; break; case 7: $x = +5; $y = $srcImg_h - $logoh - 5; break; case 8: $x = ($srcImg_w - $logow) / 2; $y = $srcImg_h - $logoh - 5; break; case 9: $x = $srcImg_w - $logow - 5; $y = $srcImg_h - $logoh -5; break; default: die("此位置不支持"); exit; } $dst_img = @imagecreatetruecolor($srcImg_w, $srcImg_h); imagecopy ( $dst_img, $srcim, 0, 0, 0, 0, $srcImg_w, $srcImg_h); if(!strcmp($markType,"img")) { imagecopy($dst_img, $markim, $x, $y, 0, 0, $logow, $logoh); imagedestroy($markim); } if(!strcmp($markType,"text")) { $rgb = explode(',', $TextColor); $color = imagecolorallocate($dst_img, $rgb[0], $rgb[1], $rgb[2]); imagettftext($dst_img, $fontSize, 0, $x, $y, $color, $fontType,$markText); } switch ($srcInfo[2]) { case 1: imagegif($dst_img, $imgSrc); break; case 2: imagejpeg($dst_img, $imgSrc); break; case 3: imagepng($dst_img, $imgSrc); break; default: die("不支持的水印图片文件类型"); exit; } imagedestroy($dst_img); imagedestroy($srcim); }
参数说明:
$imgSrc:目标图片,可带相对目录地址,
$markImg:水印图片,可带相对目录地址,支持PNG和GIF两种格式,如水印图片在执行文件mark目录下,可写成:mark/mark.gif
$markText:给图片添加的水印文字
$TextColor:水印文字的字体颜色
$markPos:图片水印添加的位置,取值范围:0~9
0:随机位置,在1~8之间随机选取一个位置
1:顶部居左 2:顶部居中 3:顶部居右 4:左边居中
5:图片中心 6:右边居中 7:底部居左 8:底部居中 9:底部居右
$fontType:具体的字体库,可带相对目录地址
$markType:图片添加水印的方式,img代表以图片方式,text代表以文字方式添加水印
4.给图片加文字水印的方法
<?php /*给图片加文字水印的方法*/ $dst_path = 'http://f4.topitme.com/4/15/11/1166351597fe111154l.jpg'; $dst = imagecreatefromstring(file_get_contents($dst_path)); /*imagecreatefromstring()--从字符串中的图像流新建一个图像,返回一个图像标示符,其表达了从给定字符串得来的图像 图像格式将自动监测,只要php支持jpeg,png,gif,wbmp,gd2.*/ $font = './t1.ttf'; $black = imagecolorallocate($dst, 0, 0, 0); imagefttext($dst, 20, 0, 10, 30, $black, $font, 'Hello world!'); /*imagefttext($img,$size,$angle,$x,$y,$color,$fontfile,$text) $img由图像创建函数返回的图像资源 size要使用的水印的字体大小 angle(角度)文字的倾斜角度,如果是0度代表文字从左往右,如果是90度代表从上往下 x,y水印文字的第一个文字的起始位置 color是水印文字的颜色 fontfile,你希望使用truetype字体的路径*/ list($dst_w,$dst_h,$dst_type) = getimagesize($dst_path); /*list(mixed $varname[,mixed $......])--把数组中的值赋给一些变量 像array()一样,这不是真正的函数,而是语言结构,List()用一步操作给一组变量进行赋值*/ /*getimagesize()能获取到什么信息? getimagesize函数会返回图像的所有信息,包括大小,类型等等*/ switch($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($dst); break; default: break; /*imagepng--以PNG格式将图像输出到浏览器或文件 imagepng()将GD图像流(image)以png格式输出到标注输出(通常为浏览器),或者如果用filename给出了文件名则将其输出到文件*/ } imagedestroy($dst); ?>

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