This article mainly introduces the method of hashing files in PHP, involving hashing techniques for files. It is of great practical value. Friends in need can refer to it.
The example of this article tells about the hashing of files by PHP. Method for performing hash operations. The details are as follows:
This code is very useful. If you download a file and the website provides a hash result, you can perform a hash operation on the file you downloaded to verify whether the downloaded file is correct.
<html> <head> <title>Hash (Check) Files</title> <style type='text/css'> #ok{color:green;} #nono{color:red;} </style> </head> <body> <?php if(!empty($_FILES)){ if ($_FILES["file"]["error"] > 0){ switch($_FILES["file"]["error"]){ case 1: echo "<b id='nono'>Error: The uploaded file exceeds the upload_max_filesize directive in php.ini</b><br>"; break; case 2: echo "<b id='nono'>Error: The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form.</b><br>"; break; case 3: echo "<b id='nono'>Error: The uploaded file was only partially uploaded.</b><br>"; break; case 4: echo "<b id='nono'>Error: No file was uploaded.</b><br>"; break; case 6: echo "<b id='nono'>Error: Missing a temporary folder.</b><br>"; break; case 7: echo "<b id='nono'>Error: Failed to write file to disk.</b><br>"; break; case 8: echo "<b id='nono'>Error: A PHP extension stopped the file upload.</b><br>"; break; default: echo "<b id='nono'>Unknown error occured.</b><br>"; } } else { echo 'Upload: ' . $_FILES['file']['name'] . '<br>'; echo 'Type: ' . $_FILES['file']['type'] . '<br>'; echo 'Size: ' . (round($_FILES['file']['size'] / 1024, 2)) . ' Kb<br><br>'; if(array_search($_POST['algo'], hash_algos())===false){ echo 'Unknown hashing algorithm requested.<br>'; } else { echo 'Hashing Algorithm: '. $_POST['algo'] . '<br>'; $hash = hash_file($_POST['algo'], $_FILES['file']['tmp_name']); echo 'Calculated hash: ' . $hash . '<br>'; if($_POST['exphash']!=='none' && !empty($_POST['exphash'])){ echo 'Expected hash: ' . $_POST['exphash'] . '<br><br>'; echo ($hash==$_POST['exphash'])? '<b id="ok">Hash matched expected value.</b>' : '<b id="nono">Hash did not match expected value.</b>'; echo '<br>'; } } } ?> <br> <button onClick="document.location.reload(true)">Again</button> <?php } else { ?> <form action="" method="post" enctype="multipart/form-data"> <input type="hidden" name="exphash" value="none"> <label for="file">Filename:</label> <input type="file" name="file" id="file"> <input type="submit" name="submit" value="Submit" /><br> <label>Expected hash(optional): <input type="text" name="exphash" size="100"></label> <br><br>Choose an algorithm (This is the list of all the available algorithms in your php installation)<br> <?php foreach(hash_algos() as $algo){ if($algo=='md5'){ echo "<label><input type='radio' name='algo' value='$algo' checked='checked'>$algo</label><br>"; } else { echo "<label><input type='radio' name='algo' value='$algo'>$algo</label><br>"; } } ?> </form> <?php } ?> </body> </html>
##Summary: The above is the entire content of this article, I hope it can be helpful to everyone’s learning help.
Related recommendations:
php uses regular expressions to extract links in content
PHP Implement digital paging function
PHP form data validation class
The above is the detailed content of Brief description of php hash operation on files. For more information, please follow other related articles on the PHP Chinese website!

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

Dreamweaver Mac version
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

WebStorm Mac version
Useful JavaScript development tools