这篇文章主要介绍了php修改上传图片大小的方法,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修改上传图片大小的方法。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($uploadedfile);// capture the original size of the uploaded imagelist($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 $tmp imageimagecopyresampled($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.?>
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以上就是php修改上传图片大小的方法的详细内容。