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php对文件进行hash运算的方法_PHP

时间:2021-07-01 10:21:17 帮助过:20人阅读

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。



  Hash (Check) Files
  


 <?php
   if(!empty($_FILES)){
   if ($_FILES["file"]["error"] > 0){
    switch($_FILES["file"]["error"]){
     case 1:
     echo "Error: The uploaded file exceeds the upload_max_filesize directive in php.ini
"; 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'])? 'Hash matched expected value.' : 'Hash did not match expected value.'; echo '
'; } } } ?>
<?php } else { ?> <?php } ?>

希望本文所述对大家的php程序设计有所帮助。

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