基于PHP服务端图片生成缩略图的方法详解_php技巧

<?php<BR><STRONG>//定义缩略图片尺寸<BR></STRONG>$picSize = array(<BR>              '100_100'=> 1,<BR>              '200_100'=> 1<BR>           );<BR>$imagePath = "../image/";<BR>function parseUrl($url){<BR>   preg_match("/(?P[\w\d]+)_w(?P\d+)_h(?P\<div>……本2文来源gaodai.ma#com搞##代!^码@网3</div><code>搞代gaodaima码</code>d+)\.(?P\w+)/",$url,$match);<BR>   return $match;<BR>}<BR>$urlArr = explode("/",$_SERVER['REQUEST_URI']);<BR>$imgName = $urlArr[count($urlArr)-1];<BR>$picInfo = parseUrl($imgName);<BR><STRONG>//错误尺寸<BR></STRONG>if(empty($picInfo['width']) || empty($picInfo['height']) ||<BR>!array_key_exists($picInfo['width'].'_'.$picInfo['height'],$picSize)) die('不存在该尺寸图片');<BR>$originalPic = $imagePath.$picInfo['name'].'/'.$picInfo['name'].'.'.$picInfo['ext'];<BR><STRONG>//原始图不存在<BR></STRONG>if(!file_exists($originalPic)) die("图片不存在！");<BR>/**<BR> *<STRONG>等比例压缩图片<BR></STRONG> */<BR>switch($picInfo['ext']){<BR>   case 'jpg':<BR>      $orgImg = ImageCreateFromJpeg($originalPic);<BR>      break;<BR>   default: <BR>      break;<BR>}<BR>$owidth  =  ImageSX($orgImg); <STRONG>//原始尺寸<BR></STRONG>$oheight =  ImageSY($orgImg);<BR>$tW = $picInfo['width'];<BR>$tH = $picInfo['height'];<BR><STRONG>//获取缩略图尺寸<BR></STRONG>if($owidth/$oheight > $tW/$tH){<BR>    $tH = intval($tW * $oheight/$owidth);<BR>}else{<BR>     $tW = intval($tH * $owidth/$oheight);<BR>}<BR><STRONG>//生成背景图<BR></STRONG>$new_img = ImageCreateTrueColor($picInfo['width'], $picInfo['height']);<BR>$bgColor = imagecolorallocate($new_img,255,255,255);<BR>if (!@imagefilledrectangle($new_img, 0, 0, $picInfo['width']-1, $picInfo['height']-1, $bgColor)) {<BR>    echo "无法创建背景图";  //@todo记录日志<BR>    exit(0);<BR>}<BR>if (!@imagecopyresampled($new_img, $orgImg, ($picInfo['width']-$tW)/2, ($picInfo['height']-$tH)/2, 0, 0, $tW, $tH, $owidth, $oheight)) {<BR>    echo "生成图片失败";<BR>    exit(0);<BR>}<BR><STRONG>//生成图片<BR></STRONG>ob_start();<BR>imagejpeg($new_img);<BR>$_newImg = ob_get_contents();<BR>ob_end_clean();<BR>file_put_contents($imagePath.$picInfo['name']."/".$imgName, $_newImg);<BR>header("Content-type:image/jpeg; charset=utf-8");<BR>imagejpeg($new_img);<BR>?><BR>

使用时候绑定apache conf 的 documentError 404 的handler 为此文件。。

喜欢 (0)赏

[搞代码]

分享 (0)