php上传图片生成缩略图（GD库）

首先来一段简单的php上传图片生成缩略图的详细代码，分享给大家供大家参考，具体内容如下

<?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)}}?>

接下来再为大家推荐一个实例php使用GD库上传图片以及创建缩略图，直接看代码：

GD库是PHP进行图象操作一个很强大的库。

先在php.ini里增加一行引用：extension=php_gd2.dll

重启apache，做一个测试页var_dump(gd_info());输出数据表明GD库引用成功。

图片上传页面 upload.html

<html><head><meta http-equiv='Content-Type' content='text/html; charset=utf-8'><title>图片上传</title></head><body><h1>文件上传(只允许上传jpg类型图片)</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>

处理页面upload_img.php

<?php //上传图片保存地址 $uploadfile = "upfiles/".$_FILES['upfile']['name']; //缩略图保存地址 $smallfile = "upfiles/small_".$_FILES['upfile']['name']; if($_FILES['upfile']['type'] != "image/jpeg") { echo '文件类型错误'; } else { move_uploaded_file($_FILES['upfile']['tmp_name'],$uploadfile); //上传文件 $dstW=200;//缩略图宽 $dstH=200;//缩略图高 $src_image=ImageCreateFromJPEG($uploadfile); $srcW=ImageSX($src_image); //获得图片宽 $srcH=ImageSY($src_image); //获得图片高 $dst_image=ImageCreateTrueColor($dstW,$dstH); ImageCopyResized($dst_image,$src_image,0,0,0,0,$dstW,$dstH,$srcW,$srcH); ImageJpeg($dst_image,$smallfile); echo '文件上传成功<br>'; echo "<img src='$smallfile' />"; }?>

希望对大家学习php程序设计有所帮助，谢谢大家的支持。

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