可定制的PHP缩略图生成程式(需要GD库支持)
W3C CSS 2017-03-29
经典的PHP缩略图生成程式,基于GD库,可指定生成路径及生成目标的宽高细节 使用方法: 在支持GD库的PHP环境中,将以下代码另存为resize.php测试
经典的PHP缩略图生成程式,基于GD库,可指定生成路径及生成目标的宽高细节
使用方法: 在支持GD库的PHP环境中,将以下代码另存为resize.php测试
复制代码 代码如下:
<? $FILEname="image_name"; // 生成图片的宽度 $RESIZEWIDTH=400; // 生成图片的高度 $RESIZEHEIGHT=400; //生成图片的路径 $uploaddir="c:/winnt/temp"; function ResizeImage($im,$maxwidth,$maxheight,$name){ global $uploaddir; $width = imagesx($im); $height = imagesy($im); if(($maxwidth && $width > $maxwidth) || ($maxheight && $height > $maxheight)){ if($maxwidth && $width > $maxwidth){ $widthratio = $maxwidth/$width; $RESIZEWIDTH=true; } if($maxheight && $height > $maxheight){ $heightratio = $maxheight/$height; $RESIZEHEIGHT=true; } if($RESIZEWIDTH && $RESIZEHEIGHT){ if($widthratio < $heightratio){ $ratio = $widthratio; }else{ $ratio = $heightratio; } }elseif($RESIZEWIDTH){ $ratio = $widthratio; }elseif($RESIZEHEIGHT){ $ratio = $heightratio; } $newwidth = $width * $ratio; $newheight = $height * $ratio; if(function_exists("imagecopyresampled")){ $newim = imagecreatetruecolor($newwidth, $newheight); imagecopyresampled($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height); }else{ $newim = imagecreate($newwidth, $newheight); imagecopyresized($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height); } ImageJpeg ($newim,$uploaddir.$name . ".jpg"); ImageDestroy ($newim); }else{ ImageJpeg ($im,$uploaddir.$name . ".jpg"); } } if($_FILES['image']['size']){ if($_FILES['image']['type'] == "image/pjpeg"){ $im = imagecreatefromjpeg($_FILES['image']['tmp_name']); }elseif($_FILES['image']['type'] == "image/x-png"){ $im = imagecreatefrompng($_FILES['image']['tmp_name']); }elseif($_FILES['image']['type'] == "image/gif"){ $im = imagecreatefromgif($_FILES['image']['tmp_name']); } if($im){ if(file_exists("$FILENAME.jpg")){ unlink("$FILENAME.jpg"); } ResizeImage($im,$RESIZEWIDTH,$RESIZEHEIGHT,$FILENAME); ImageDestroy ($im); } } ?> <img src="<? echo($FILENAME.".jpg?reload=".rand(0,999999)); ?>"><br><br> <form enctype="multipart/form-data" method="post"> <br> <input type="file" name="image" size="50" value="浏览"><p> <input type="submit" value="上传图片"> </form> </body> </html>
