php修改上傳圖片大小的方法

這篇文章主要介紹了php修改上傳圖片大小的方法,涉及php操作圖片的技巧,非常具有實用價值,需要的朋友可以參考下

本文實例講述了php修改上傳圖片大小的方法。分享給大家供大家參考。具體實現方法如下：

<?php
// This is the temporary file created by PHP
$uploadedfile = $_FILES[&#39;uploadfile&#39;][&#39;tmp_name&#39;];
// 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/". $_FILES[&#39;uploadfile&#39;][&#39;name&#39;];
imagejpeg($tmp,$filename,100);
imagedestroy($src);
imagedestroy($tmp);
// NOTE: PHP will clean up the temp file it created when the request
// has completed.
?>

總結：以上就是這篇文章的全部內容，希望能對大家的學習有所幫助。

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