How to modify the size of uploaded images in php

This article mainly introduces the method of changing the size of uploaded images in PHP. It involves the skills of operating images in PHP. It is of great practical value. Friends in need can refer to it.

The example in this article tells the story of changing the size of uploaded images in PHP. Methods. Share it with everyone for your reference. The specific implementation method is as follows:

<?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.
?>

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