php修改上传图片尺寸的方法_PHP教程

php修改上传图片尺寸的方法

2020-09-18 15:55不吃皮蛋 PHP教程

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.

									?>