用PHP上传图片并修改尺寸

April 10, 2009 by SLJ | Category:PHP | No Comment Font size: AA   AA

对于开发一个WEB2.0的网站，对于用户上传图片的功能是少不了的，上传后的图片需要自动调整尺寸，以生成缩略图，无论从页面载入速度上，服务器负重上来看，调整尺寸都是必不可少的。

贴上一段用PHP上传图片并修改尺寸的代码，初学者可以看看。也可以自己修改修改，写成类。

原文地址：Image Uploading and Resizing with PHP

一、HTML代码部分

二、上传图片并保存至服务器的代码 (upload.php)

// This is the temporary file created by PHP
$uploadedfile = $_FILES['uploadfile']['tmp_name'];

// Create an Image from it so we can do the resize
$src = imagecreatefromjpeg($uploadedfile);

// Capture the original size of the uploaded image
list($width,$height)=getimagesize($uploadedfile);

// For our purposes, I have resized the image to be
// 600 pixels wide, and maintain the original aspect
// ratio. This prevents the image from being "stretched"
// or "squashed". If you prefer some max width other than
// 600, simply change the $newwidth variable
$newwidth=600;
$newheight=($height/$width)*$newwidth;
$tmp=imagecreatetruecolor($newwidth,$newheight);

// this line actually does the image resizing, copying from the original
// image into the $tmp image
imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height); 

// now write the resized image to disk. I have assumed that you want the
// resized, uploaded image file to reside in the ./images subdirectory.
$filename = "images/". $_FILES['uploadfile']['name'];
imagejpeg($tmp,$filename,100);

imagedestroy($src);
imagedestroy($tmp); // NOTE: PHP will clean up the temp file it created when the request
// has completed.

最后贴上一个网上找到的类 点击打开

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