PHP 图片上传生成缩略图代码

最新PHP 图片上传生成缩略图代码

以下是三零网为大家整理的最新PHP 图片上传生成缩略图代码的文章，希望大家能够喜欢!

一个比较简单的PHP生成缩略图程序，参数及代码都算得上精简。

<?php $FILENAME = "image_name"; // 生成图片的宽度 $RESIZEWIDTH = 400; // 生成图片的高度 $RESIZEHEIGHT = 400; function ResizeImage($im, $maxwidth, $maxheight, $name){     $width = imagesx($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, $name . ".jpg");         ImageDestroy ($newim);         }else{         ImageJpeg ($im, $name . ".jpg");         }     } if($_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>

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