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
<?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裡增加一行引用：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。
