php图片处理类(生成缩略图,图片尺寸调整,图片截取,图片加水印,图片旋转 )
注意这个类库有一个重名的叫phpThumb,只是大小写的差别,所以查找文档的时候千万注意。 在网站建设过程中,需要处理图片的地方多不胜数,用PHP的图片函数处理图片,十分繁琐。而且对新手来讲十分不好掌握。现在我们可以用PHPThumb类库来处理图片,包括,图片尺寸调整,图片截取,图片加水印,图片旋转等等功能
使用演示:
代码如下 | 复制代码 |
//加载类库文件 //实例化类库,传入你要处理的图片的地址可以是网络地址,也可以是本地地址 //把图片等比缩小到最大宽度 100px或者最高100px,当只输入一个参数的时候,是限制最宽的尺寸。 //把图片等比缩小到原来的百分数,比如50就是原来的50%。 //截取一个175px * 175px的图片,注意这个是截取,超出的部分直接裁切掉,不是强制改变尺寸。 //从图片的中心计算,截取200px * 100px的图片。 //截图,前两个参数分别是需要解出的图片的右上角的坐标X,Y。 后面两个参数是需要解出的图片宽,高。 //把图片顺时针反转180度 //保存(生成)图片,你可以保存其他格式,详细参考文档 |
这个类库还有更多功能就不多做介绍了,如果你也在开发PHP网站过程中需要处理图片不妨阅读一下这个类库的文档,保证你处理图片很简单,再也不用和那十几个烦人的php图片处理函数打交道了!
另外一个强大的PHP图片缩略图类:phpThumb
该类除了缩放图片外,还能将图片转换成不同的格式输出(比如将GIF格式的图片输出为PNG格式),其特色功能还包括色彩、特效等
官方网址:http://phpthumb.sourceforge.net/
We’ll be using phpThumb , the open source PHP script to generate thumbnails on the fly.
Download and extract phpThumb to somewhere in your website folder. Now to use a rounded corner thumbnail of an image, simply use the img tag of HTML with src as
代码如下 | 复制代码 |
![]() Adjust the path to phpThumb according to where you place the phpThumb files. ![]() |
一般只需要下面的文件就可以了
其实phpThumb的功能比我原先想象的要强大一些,下面把他的其他一些有用的参数列一下:
src:目标图片的地址
w:输出图片的宽度
h:输出图片的高度(如果不指定他将按w参数等比缩放)
q:输出如果是JPG格式的,可以规定它的输出质量
bg:输出时的背景(如果需要)
sw、sh、sx、sy:局部输出,宽高、起始位置
f:输出格式,可以为jpeg、png、gif、ico
sfn:输出gif动画中的某一帧
fltr[]:滤镜,可以有很多效果,包括锐化、模糊、旋翻转、水印、边框、遮照、色彩调整等

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