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

<?php
function 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>
<  http-equiv=\'Content-Type\' content=\'text/html; charset=utf-8\'>
< >图片上传</ >
</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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