php简单实用生成缩略图代码

本程序是根据用户上传图片后再把上传的图片按比例生成缩略图

<script>ec(2);</script>

代码如下

复制代码

$w?$resizewidth=$w:$resizewidth=400;// 生成图片的宽度 $h?$resizeheight=$h:$resizeheight=400;// 生成图片的高度 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                 $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,$name);         imagedestroy ($newim);     }else{         imagejpeg ($im,$name);     } } if($_files['uploadfile']['size']){     if($_files['uploadfile']['type'] == "image/pjpeg"){         $im = imagecreatefromjpeg($_files['uploadfile']['tmp_name']);     }elseif($_files['uploadfile']['type'] == "image/x-png"){         $im = imagecreatefrompng($_files['uploadfile']['tmp_name']);     }elseif($_files['uploadfile']['type'] == "image/gif"){         $im = imagecreatefromgif($_files['uploadfile']['tmp_name']);     }     if($im){         if(file_exists('bbs.jpg')){             unlink('bbs.jpg');         }         resizeimage($im,$resizewidth,$resizeheight,'bbs.jpg');         imagedestroy ($im);        } } //$uploadfile="www.111cn.net.jpg"; ?>