php修改上传图片尺寸的方法
这篇文章主要介绍了php修改上传图片尺寸的方法,涉及php操作图片的技巧,非常具有实用价值,需要的朋友可以参考下。
本文实例讲述了php修改上传图片尺寸的方法，分享给大家供大家参考，具体实现方法如下：
- <?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)*600;
- $tmp=imagecreatetruecolor($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.
- ?>