php 打包gd 库

php 封装gd 库

使用sae 版 thinkphp 在本地和sae 上无法实现缩略图，缩略图主要使用在瀑布流上面，不然一张图片2 3 M，速度太慢，就自己封装了一个，见笑！

<code class=" hljs xml"><span class="php"><span class="hljs-preprocessor"><?php</span><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Thumb</span>{</span>    <span class="hljs-comment">// 设置最大宽度，用来在编辑器中使用和显示</span>    <span class="hljs-keyword">private</span>  <span class="hljs-variable">$max_width</span>  = <span class="hljs-keyword">null</span>;    <span class="hljs-keyword">private</span>  <span class="hljs-variable">$file_name</span>  = <span class="hljs-keyword">null</span>;    <span class="hljs-keyword">private</span>  <span class="hljs-variable">$water_name</span> = <span class="hljs-keyword">null</span>;    <span class="hljs-comment">//获得文件名和图片宽度</span>    <span class="hljs-keyword">public</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">__construct</span><span class="hljs-params">(<span class="hljs-variable">$max_widht</span>,<span class="hljs-variable">$file_name</span>,<span class="hljs-variable">$water_name</span>)</span> {</span>        <span class="hljs-variable">$this</span>->max_width  = <span class="hljs-variable">$max_widht</span>;        <span class="hljs-variable">$this</span>->file_name  = <span class="hljs-variable">$file_name</span>;        <span class="hljs-variable">$this</span>->water_name = <span class="hljs-variable">$water_name</span>;    }    <span class="hljs-keyword">public</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">create_image</span><span class="hljs-params">()</span>{</span>        <span class="hljs-comment">// 获得ori图片信息</span>        <span class="hljs-keyword">list</span>(<span class="hljs-variable">$width</span>,<span class="hljs-variable">$height</span>,<span class="hljs-variable">$type</span>) = getimagesize(<span class="hljs-variable">$this</span>->file_name);              <span class="hljs-comment">// 当原有图片大于 要求的最大宽度时，才需要进行压缩</span>        <span class="hljs-keyword">if</span>(<span class="hljs-variable">$width</span> > <span class="hljs-variable">$this</span>->max_width){            <span class="hljs-comment">// 获得图片压缩百分比</span>            <span class="hljs-variable">$per</span> = <span class="hljs-variable">$this</span>->max_width / <span class="hljs-variable">$width</span>;            <span class="hljs-variable">$new_width</span> = <span class="hljs-variable">$width</span> * <span class="hljs-variable">$per</span>;            <span class="hljs-variable">$new_height</span> = <span class="hljs-variable">$height</span> * <span class="hljs-variable">$per</span>;                  }<span class="hljs-keyword">else</span>{            <span class="hljs-variable">$new_height</span> =  <span class="hljs-variable">$height</span>;            <span class="hljs-variable">$new_width</span>  =  <span class="hljs-variable">$width</span>;        }        <span class="hljs-comment">//创建一个真彩色图像</span>        <span class="hljs-variable">$image_p</span> = imagecreatetruecolor(<span class="hljs-variable">$new_width</span>, <span class="hljs-variable">$new_height</span> -<span class="hljs-number">10</span>);        <span class="hljs-variable">$image</span> = <span class="hljs-variable">$this</span>->image_obj(<span class="hljs-variable">$type</span>,  <span class="hljs-variable">$this</span>->file_name);         imagecopyresampled(<span class="hljs-variable">$image_p</span>, <span class="hljs-variable">$image</span>, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>, <span class="hljs-variable">$new_width</span>, <span class="hljs-variable">$new_height</span>, <span class="hljs-variable">$width</span>, <span class="hljs-variable">$height</span>);        <span class="hljs-variable">$this</span>->image_dump(<span class="hljs-variable">$type</span>, <span class="hljs-variable">$image_p</span>, <span class="hljs-variable">$this</span>->file_name);        <span class="hljs-variable">$this</span>->water();    }    <span class="hljs-comment">/*     * 生成为图片添加水印     */</span>    <span class="hljs-keyword">private</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">water</span><span class="hljs-params">()</span>{</span>        <span class="hljs-variable">$water_name</span> = <span class="hljs-variable">$this</span>->water_name;        <span class="hljs-variable">$dist_name</span> = <span class="hljs-variable">$this</span>->file_name;        <span class="hljs-keyword">list</span>(<span class="hljs-variable">$dist_width</span>,<span class="hljs-variable">$dist_height</span>,<span class="hljs-variable">$type</span>) = getimagesize(<span class="hljs-variable">$dist_name</span>);        <span class="hljs-variable">$dist_im</span>   = <span class="hljs-variable">$this</span>->image_obj(<span class="hljs-variable">$type</span>, <span class="hljs-variable">$this</span>->file_name);        <span class="hljs-variable">$water_name</span> = <span class="hljs-string">"D:/xampps/htdocs/buyingfeiblog/1/App/Modules/Admin/Tpl/Public/Images/water.png"</span>;        <span class="hljs-keyword">list</span>(<span class="hljs-variable">$w_width</span>,<span class="hljs-variable">$w_height</span>) = getimagesize(<span class="hljs-variable">$water_name</span>); <span class="hljs-comment">// 获得图片水印信息</span>        <span class="hljs-variable">$water_src</span> =  imagecreatefrompng(<span class="hljs-variable">$water_name</span>);        <span class="hljs-comment">// 设置图片水印位置 在右下角</span>        <span class="hljs-variable">$x</span> = (<span class="hljs-variable">$dist_width</span> - <span class="hljs-variable">$w_width</span>) / <span class="hljs-number">4</span> * <span class="hljs-number">3</span> ;        <span class="hljs-variable">$y</span> =(<span class="hljs-variable">$dist_height</span> - <span class="hljs-variable">$w_height</span>) /<span class="hljs-number">4</span> * <span class="hljs-number">3</span> ;        <span class="hljs-keyword">if</span>(imagecopy(<span class="hljs-variable">$dist_im</span>, <span class="hljs-variable">$water_src</span>, <span class="hljs-variable">$x</span>, <span class="hljs-variable">$y</span>, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>, <span class="hljs-variable">$w_width</span>, <span class="hljs-variable">$w_height</span>)){            imagepng(<span class="hljs-variable">$dist_im</span>,<span class="hljs-variable">$dist_name</span>);            <span class="hljs-keyword">echo</span> <span class="hljs-string">"success"</span>;        }<span class="hljs-keyword">else</span>{            <span class="hljs-keyword">echo</span> <span class="hljs-string">"error"</span>;        }    }    <span class="hljs-comment">// 生成图片类型，生成不同图片 保持图片原本类型不发生变化</span>    <span class="hljs-keyword">private</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">image_dump</span><span class="hljs-params">(<span class="hljs-variable">$type</span>,<span class="hljs-variable">$image_p</span>,<span class="hljs-variable">$filename</span>)</span>{</span>         <span class="hljs-keyword">switch</span> (<span class="hljs-variable">$type</span>){            <span class="hljs-keyword">case</span> <span class="hljs-number">1</span>:                imagegif(<span class="hljs-variable">$image_p</span>, <span class="hljs-variable">$filename</span>);                <span class="hljs-variable">$dis_im</span> = imagecreatefromgif(file_name);                <span class="hljs-keyword">break</span>;            <span class="hljs-keyword">case</span> <span class="hljs-number">2</span>:                imagejpeg(<span class="hljs-variable">$image_p</span>,  <span class="hljs-variable">$this</span>->file_name);                <span class="hljs-variable">$dis_im</span> = imagecreatefromjpeg(file_name);                 <span class="hljs-keyword">break</span>;            <span class="hljs-keyword">case</span> <span class="hljs-number">3</span>:                imagepng(<span class="hljs-variable">$image_p</span>,file_name);                <span class="hljs-variable">$dis_im</span> = imagecreatefrompng(file_name);                <span class="hljs-keyword">break</span>;            <span class="hljs-keyword">default</span> :        }    }    <span class="hljs-comment">// 根据图片不同，生成不同资源对象</span>    <span class="hljs-keyword">private</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">image_obj</span><span class="hljs-params">(<span class="hljs-variable">$type</span>,<span class="hljs-variable">$filename</span>)</span>{</span>         <span class="hljs-keyword">switch</span> (<span class="hljs-variable">$type</span>){<span class="hljs-comment">//          1 = GIF，2 = JPG，3 = PNG，</span>            <span class="hljs-keyword">case</span> <span class="hljs-number">1</span>:               <span class="hljs-variable">$image</span> =   imagecreatefromgif(<span class="hljs-variable">$filename</span>);              <span class="hljs-keyword">break</span>;            <span class="hljs-keyword">case</span> <span class="hljs-number">2</span>:               <span class="hljs-variable">$image</span> =   imagecreatefromjpeg(<span class="hljs-variable">$filename</span>);              <span class="hljs-keyword">break</span>;            <span class="hljs-keyword">case</span> <span class="hljs-number">3</span>:               <span class="hljs-variable">$image</span> =   imagecreatefrompng(<span class="hljs-variable">$filename</span>);               <span class="hljs-keyword">break</span>;            <span class="hljs-keyword">default</span> :        }        <span class="hljs-keyword">return</span> <span class="hljs-variable">$image</span>;    }}    <span class="hljs-variable">$thumb</span> = <span class="hljs-keyword">new</span>  Thumb(<span class="hljs-number">725</span>,<span class="hljs-string">"D:/xampps/htdocs/test/test.jpg"</span>);    <span class="hljs-variable">$thumb</span>->create_image();<span class="hljs-comment">//create_image</span><span class="hljs-preprocessor">?></span></span></code>

就是这么简单，
主要包括生成真彩图，
创建图形对象资源
图片进行合并，ok！