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1: writing process-oriented method
//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: Object-oriented Implementation
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');
$obj->show();
3. Support pictures and text are two ways to add a watermark to the picture. Photo support GIF, PNG, JPG three formats, GIF and PNG watermark image support
function setWater($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);
}
Parameter Description:
$ imgSrc: target picture, you can address with a relative directory,
$ markImg: watermark image can be relative directory with addresses, support for PNG and GIF formats, such as the watermark image in the executable file mark directory, can be written as: mark / mark.gif
$ markText: text watermark added to the image
$ the TextColor: watermark text font color
$ markpos: image watermarking positions, in the range: 0 to 9,
0: random location, between 1 and 8 positions of a random
1: top left 2: top Center 3: top right home 4: left middle
5: images 6: the right middle 7: bottom left 8: bottom Center 9: right of abode bottom
$ fontType: specific font library, with a relative directory address
$ markType: pictures add a watermark way, img representative picture mode, on behalf of text to add a watermark as text
4. Add text watermark to image method
<?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);
?>