PHP图片等比缩放类SimpleImage使用方法和使用实例分享_php实例

使用方法示例：
设定宽度，等比例缩放

<?php<BR>   include('SimpleImage.php');<BR>   $image = new SimpleImage();<BR>   $image->load('picture.jpg');<BR>   $image->resizeToWidth(250);<BR>   $image->save('picture2.jpg');?>

设定高度，等比例缩放

<?php<BR>   include('SimpleImage.php');<BR>   $image = new SimpleImage();<BR>   $image->load('picture.jpg');<BR>   $image->resizeToHeight(500);<BR>   $image->save('picture2.jpg');<BR>   $image->resizeToHeight(200);<BR>   $image->save('picture3.jpg');?>

按比例，缩放至50%

<?php<BR>   include('SimpleImage.php');<BR>   $image = new SimpleImage();<BR>   $image->load('picture.jpg');<BR>   $image->scale(50);<BR>   $image->save('picture2.jpg');?>

缩放后直接输出到屏幕

<?php<BR>   header('Content-Type: image/jpeg');<BR>   include('SimpleImage.php');<BR>   $image = new SimpleImage();<BR>   $image->load('picture.jpg');<BR>   $image->resizeToWidth(150);<BR>   $image->output();?><BR>

使用例子：

<?php<BR>include("SimpleImage.php");//图片处理类在下面</P><P>$url="http://f3.v.veimg.cn/meadincms/1/2013/0703/20130703100937552.jpg";<BR>$picfile = down($url);//下载图片（下载图片的路径可以处理完成后清空，这里未进行处理）<BR>$res = new SimpleImage();//图片处理实例<BR>$res = $res->load($picfile);<BR>$tmpfile = tempfile().'.jpg';//创建一个路径文件用来保存图片<BR>$width = '30';//设定图片的宽度<BR>$res->resizeToWidth($width);<BR>$res->save($tmpfile);//把处理后的图片保存（无.jpg后缀）<BR>//这里总共产生了3个文件，一个是下载的图片文件，一个是临时文件，最后一个是处理的图片文件。需要优化清理掉前两个文件。</P><P> </P><P><BR>function down($url)<BR>{<BR>        $http = array();<BR>        $header = "http://f3.v.veimg.cn";<BR>        if ($header) {<BR>            $http['header'] = $header;<BR>        }</P><P>        $http['timeout'] = 50;</P><P>        $ctx = stream_context_create(array(<BR>            'http' => $http,<BR>        )); <BR>        $content = @file_get_contents($url, 0, $ctx);<BR>        sleep(1);</P><P>        if (!$content) {<BR>            return false;<BR>        }</P><P>        $tmpfile = tempfile();</P><P>        file_put_contents($tmpfile, $content);</P><P>        return $tmpfile;<BR>}</P><P>function tempfile()<BR>{<BR>        $path = dirname(__FILE__);<BR>        $path .= '/spider/' . date('Ymd') . '/'.date('His').'-' . (int)(time() / 300);</P><P>        if (!file_exists($path)) {<BR>            mkdir($path, 0777, true);<BR>        }</P><P>        do {<BR>            $file = $path . '/' . dechex(mt_rand());<BR>        }<BR>        while (file_exists($file));</P><P>        touch($file);</P><P>        return $file;<BR>}<BR>

图片处理类源码（官网地址：http://www.white-hat-web-design.co.uk/blog/resizing-images-with-php/）：

<?php<br><br>/*<BR>* File: SimpleImage.php<BR>* Author: Simon Jarvis<BR>* Copyright: 2006 Simon Jarvis<BR>* Date: 08/11/06<BR>* Link: http://www.white-hat-web-design.co.uk/articles/php-image-resizing.php<BR>*<BR>* This program is free software; you can redistribute it and/or<BR>* modify it under the terms of the GNU General Public License<BR>* as published by the Free Software Foundation; either version 2<BR>* of the License, or (at your option) any later version.<BR>*<BR>* This program is distributed in the hope that it will be useful,<BR>* but WITHOUT ANY WARRANTY; without even the implied warranty of<BR>* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the<BR>* GNU General Public License for more details:<BR>* http://www.gnu.org/licenses/gpl.html<BR>*<BR>*/<br><br>class SimpleImage {<br><br>    var $image;<BR>    var $image_type;<br><br>    function load($filename) {<br><br>        $image_info = getimagesize($filename);<BR>        $this->image_type = $image_info[2];<BR>        if( $this->image_type == IMAGETYPE_JPEG ) {<br><br>            $this->image = @imagecreatefromjpeg($filename);<BR>        } elseif( $this->image_type == IMAGETYPE_GIF ) {<br><br>            $this->image = @imagecreatefromgif($filename);<BR>        } elseif( $this->image_type == IMAGETYPE_PNG ) {<br><br>            $this->image = @imagecreatefrompng($filename);<BR>        }<br><br>        if (!$this->image) {<BR>            return false;<BR>        }<br><br>        return $this;<BR>    }<br><br>    function save($filename, $image_type=IMAGETYPE_JPEG, $compression=75, $permissions=null) {<br><br>        if( $image_type == IMAGETYPE_JPEG ) {<BR>            imagejpeg($this->image,$filename,$compression);<BR>        } elseif( $image_type == IMAGETYPE_GIF ) {<br><br>            imagegif($this->image,$filename);<BR>        } elseif( $image_type == IMAGETYPE_PNG ) {<br><br>            imagepng($this->image,$filename);<BR>        }<BR>        if( $permissions != null) {<br><br>            chmod($filename,$permissions);<BR>        }<BR>    }<BR>    function output($image_type=IMAGETYPE_JPEG) {<br><br>        if( $image_type == IMAGETYPE_JPEG ) {<BR>            imagejpeg($this->image);<BR>        } elseif( $image_type == IMAGETYPE_GIF ) {<br><br>            imagegif($this->image);<BR>        } elseif( $image_type == IMAGETYPE_PNG ) {<br><br>            imagepng($this->image);<BR>        }<BR>    }<BR>    function getWidth() {<br><br>        return imagesx($this->image);<BR>    }<BR>    function getHeight() {<br><br>        return imagesy($this->image);<BR>    }<BR>    function resizeToHeight($height) {<br><br>        $ratio = $height / $this->getHeight();<BR>        $width = $this->getWidth() * $ratio;<BR>        $this->resize($width,$height);<BR>    }<br><br>    function resizeToWidth($width) {<BR>        if ($this->getWidth() < $width) {<BR>            $width = $this->getWidth();<BR>        }<BR>        $ratio = $width / $this->getWidth();<BR>        $height = $this->getheight() * $ratio;<BR>        $this->resize($width,$height);<BR>    }<br><br>    function scale($scale) {<BR>        $width = $this->getWidth() * $scale/100;<BR>        $height = $this->getheight() * $scale/100;<BR>        $this->resize($width,$height);<BR>    }<br><br>    function resize($width,$height) {<BR>        $new_image = imagecreatetruecolor($width, $height)<b style="color:transparent">来&源gao@dai!ma.com搞$代^码%网</b><img>搞gaodaima代码</img>;<BR>        imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());<BR>        $this->image = $new_image;<BR>    }<br><br> <BR>    function resize2($width,$height) {<BR>        $new_image = imagecreatetruecolor($width, $height);<BR>        if( $this->image_type == IMAGETYPE_GIF || $this->image_type == IMAGETYPE_PNG ) {<BR>            $current_transparent = imagecolortransparent($this->image);<BR>            if($current_transparent != -1) {<BR>                $transparent_color = imagecolorsforindex($this->image, $current_transparent);<BR>                $current_transparent = imagecolorallocate($new_image, $transparent_color['red'], $transparent_color['green'], $transparent_color['blue']);<BR>                imagefill($new_image, 0, 0, $current_transparent);<BR>                imagecolortransparent($new_image, $current_transparent);<BR>            } elseif( $this->image_type == IMAGETYPE_PNG) {<BR>                imagealphablending($new_image, false);<BR>                $color = imagecolorallocatealpha($new_image, 0, 0, 0, 127);<BR>                imagefill($new_image, 0, 0, $color);<BR>                imagesavealpha($new_image, true);<BR>            }<BR>        }<BR>        imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());<BR>        $this->image = $new_image;   <BR>    }<br><br>}<BR>

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