php对文件进行hash运算的方法
发布时间：2020-05-23 23:55:20 所属栏目：PHP 来源：互联网
导读：这篇文章主要介绍了php对文件进行hash运算的方法,涉及针对文件的hash运算技巧,非常具有实用价值,需要的朋友可以参考下
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本文实例讲述了php对文件进行hash运算的方法。分享给大家供大家参考。具体如下： 这段代码非常有用，如果你下载了一个文件，网站提供了hash结果，你可以对你下载下来的文件进行hash运算，以验证下载的文件是否正确。 "; break; case 2: echo "Error: The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form. "; break; case 3: echo "Error: The uploaded file was only partially uploaded. "; break; case 4: echo "Error: No file was uploaded. "; break; case 6: echo "Error: Missing a temporary folder. "; break; case 7: echo "Error: Failed to write file to disk. "; break; case 8: echo "Error: A PHP extension stopped the file upload. "; break; default: echo "Unknown error occured. "; } } else { echo 'Upload: ' . $_FILES['file']['name'] . ' '; echo 'Type: ' . $_FILES['file']['type'] . ' '; echo 'Size: ' . (round($_FILES['file']['size'] / 1024,2)) . ' Kb '; if(array_search($_POST['algo'],hash_algos())===false){ echo 'Unknown hashing algorithm requested. '; } else { echo 'Hashing Algorithm: '. $_POST['algo'] . ' '; $hash = hash_file($_POST['algo'],$_FILES['file']['tmp_name']); echo 'Calculated hash: ' . $hash . ' '; if($_POST['exphash']!=='none' && !empty($_POST['exphash'])){ echo 'Expected hash: ' . $_POST['exphash'] . ' '; echo ($hash==$_POST['exphash'])? '' : ''; echo ' '; } } } ?> |