首先來一段簡單的php上傳圖片生成縮略圖的詳細代碼，分享給大家供大家參考，具體內容如下
<?phpfunction createThumbnail($imageDirectory, $imageName, $thumbDirectory, $thumbWidth, $quality){$details = getimagesize("$imageDirectory/$imageName") or die('Please only upload images.');$type = preg_replace('@^.+(?<=/)(.+)$@', '$1', $details['mime']);eval('$srcImg = imagecreatefrom'.$type.'("$imageDirectory/$imageName");');$thumbHeight = $details[1] * ($thumbWidth / $details[0]);$thumbImg = imagecreatetruecolor($thumbWidth, $thumbHeight);imagecopyresampled($thumbImg, $srcImg, 0, 0, 0, 0, $thumbWidth, $thumbHeight,$details[0], $details[1]);eval('image'.$type.'($thumbImg, "$thumbDirectory/$imageName"'.(($type=='jpeg')?', $quality':'').');');imagedestroy($srcImg);imagedestroy($thumbImg);}foreach ($_FILES["pictures"]["error"] as $key => $error) {if ($error == UPLOAD_ERR_OK) {$tmp_name = $_FILES["pictures"]["tmp_name"][$key];$name = $_FILES["pictures"]["name"][$key];move_uploaded_file($tmp_name, "data/$name");createThumbnail("/location/of/main/image", $name, "/location/to/store/thumb", 120, 80);//120 = thumb width :: 80 = thumb quality (1-100)}}?> 接下來再為大家推薦一個實例php使用GD庫上傳圖片以及創建縮略圖，直接看代碼：
GD庫是PHP進行圖象操作一個很強大的庫。
先在php.ini里增加一行引用：extension=php_gd2.dll
重啟apache，做一個測試頁var_dump(gd_info());輸出數據表明GD庫引用成功。
圖片上傳頁面 upload.html
<html><head><meta http-equiv='Content-Type' content='text/html; charset=utf-8'><title>圖片上傳</title></head><body><h1>文件上傳(只允許上傳jpg類型圖片)</h1><form enctype="multipart/form-data" action="upload_img.php" method="post"> <input name="upfile" type="file"><br><br> <input type="submit" value="提交"></form></body></html>
處理頁面upload_img.php
<?php //上傳圖片保存地址 $uploadfile = "upfiles/".$_FILES['upfile']['name']; //縮略圖保存地址 $smallfile = "upfiles/small_".$_FILES['upfile']['name']; if($_FILES['upfile']['type'] != "image/jpeg") { echo '文件類型錯誤'; } else { move_uploaded_file($_FILES['upfile']['tmp_name'],$uploadfile); //上傳文件 $dstW=200;//縮略圖寬 $dstH=200;//縮略圖高 $src_image=ImageCreateFromJPEG($uploadfile); $srcW=ImageSX($src_image); //獲得圖片寬 $srcH=ImageSY($src_image); //獲得圖片高 $dst_image=ImageCreateTrueColor($dstW,$dstH); ImageCopyResized($dst_image,$src_image,0,0,0,0,$dstW,$dstH,$srcW,$srcH); ImageJpeg($dst_image,$smallfile); echo '文件上傳成功<br>'; echo "<img src='$smallfile' />"; }?> 希望對大家學習php程序設計有所幫助，謝謝大家的支持。
