PHP Tutorial #24 Filters Part 2 " FILTER_SANITIZE " by alexendre-maxim

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utopian-io · @alexendre-maxim · Mar 22 '19 (edited)

$21.58

PHP Tutorial #24 Filters Part 2 " FILTER_SANITIZE "

<html>
<p><img src="https://cdn.steemitimages.com/DQmR2CdPgUAaypJwbE8QhahqDxrabLTM5fHq8ZjTPcVr2fg/bbva-open4u-herramientas-basicas-desarrolladores-php_1.jpg" width="2122" height="1415"/></p>
<p><a href="https://cdn.steemitimages.com/DQmR2CdPgUAaypJwbE8QhahqDxrabLTM5fHq8ZjTPcVr2fg/bbva-open4u-herramientas-basicas-desarrolladores-php_1.jpg">Image Source</a></p>
<h2>Repository</h2>
<p><a href="https://github.com/php/php-src">https://github.com/php/php-src</a>&nbsp;</p>
<h2>What Will I Learn?</h2>
<ul>
  <li>You will learn the " FILTER_SANITIZE_EMAIL " and " FILTER_SANITIZE_ENCODED ".</li>
  <li>You will learn the " FILTER_SANITIZE_QUOTES " and " FILTER_SANITIZE_FLOAT ".</li>
  <li>You will learn the " FILTER_SANITIZE_INT " and " FILTER_SANITIZE_SPECIAL_CHARS &nbsp;".</li>
  <li>You will learn the " FILTER_SANITIZE_STRING " and " FILTER_SANITIZE_URL ".</li>
</ul>
<h2>Requirements</h2>
<h5>System Requirements:</h5>
<ul>
  <li>Server support PHP , <a href="https://www.apachefriends.org/fr/download.html">Xampp</a> or <a href="http://www.wampserver.com/">Wamp</a> for example</li>
  <li>An IDE like <a href="https://www.sublimetext.com/download">Sublime text</a>.</li>
  <li>Browser (<a href="https://www.google.com/intl/fr_ALL/chrome/">Chrome</a> for example)&nbsp;&nbsp;</li>
</ul>
<h5>OS Support for PHP</h5>
<ul>
  <li>Windows</li>
  <li>macOS</li>
  <li>Linux</li>
</ul>
<h4>Required Knowledge</h4>
<ul>
  <li>HTML language</li>
  <li>CSS language</li>
</ul>
<h2>Difficulty</h2>
<ul>
  <li>&nbsp;Intermediate&nbsp;</li>
</ul>
<h2>Description</h2>
<p>In this tutorial we will learn the second part of "filters", in the previous tutorial we have learned the "<code>FILTER_VALIDATE</code>", today we will take the "<code>FILTER_SANITIZE</code>".</p>
<p>The idea is that the "<code>FILTER_VALIDATE</code>" will test and will validate if the value entered by the user is suitable and is correct with the type of the column in the database for example or not.</p>
<p>But the "<code>FILTER_SANITIZE</code>" will clean or delete all the characters that don't belong to this type, and will return the original caracters of this type.</p>
<p>We need before validation to do the impossible and to minimize the faults of the user, and for that we will use before any validate the sanitize.</p>
<p>PHP offers 11 types of filtering, we will see 8 important types with their flags and use.</p>
<h3>FILTER_SANITIZE_EMAIL , QUOTES and URL&nbsp;</h3>
<p>Before using the validation filters as we have already said, we must minimize the rate of mistakes by the use of cleaning filters, for that we have the " <code>FILTER_SANITIZE_EMAIL</code> " that goes Deletes all the characters except the letters, numbers, and these characters : <code>[! # $% &amp; '* + - =? ^ _ `{|} ~ @. []] </code>, to return a correct email.</p>
<p>And we also have the " <code>FILTER_SANITIZE_URL</code> " to delete all characters except the letters, digits, and special characters : <code>[$ -_. +! * '(), {} | \\ ^ ~ [] `&lt;&gt; #%"; /? : @ &amp; =]</code> to clean the URL.</p>
<p>Finally we have the " <code>FILTER_SANITIZE_MAGIC_QUOTES</code> ", which will apply the rules of the " <code>addslaches()</code> " function, to add backslaches before the characters :&nbsp;</p>
<p>Single quotation marks (')</p>
<p>Double quotation marks (")</p>
<p><img src="https://cdn.steemitimages.com/DQmWxi1kzk2JuKrrGEywvTNQnLLdiauVh31WMbwMNAx9z9E/1.jpg" width="939" height="540"/></p>
<h3>FILTER_SANITIZE_FLOAT and INT&nbsp;</h3>
<p>We have learned the previous tutorial that we can easly validate the value entered by the user if it's a correct value or not , or it's a number or not, with both possibilties "Float and Int", today is in this tutorial, we will learn how to sanitize the value entered by the user to be a correct number, using " <code>FILTER_SANITIZE_NUMBER_FLOAT</code> " and these flags</p>
<p>FILTER_FLAG_ALLOW_FRACTION</p>
<p>FILTER_FLAG_ALLOW_THOUSAND</p>
<p>FILTER_FLAG_ALLOW_SCIENTIFIC</p>
<p>And also the " <code>FILTER_SANITIZE_NUMBER_INT</code> " .</p>
<p><img src="https://cdn.steemitimages.com/DQmYF5ZiYC3rxUmjQ3jRCWmmDgiaMsp5aLpvrL9EEsYAZER/capture-20190322-020545.png" width="1044" height="391"/></p>
<h3>FILTER_SANITIZE_ENCODED, STRING and &nbsp;FILTER_SANITIZE_SPECIAL_CHARS&nbsp;</h3>
<p>For the security of your site or database, you must use the " <code>FILTER_SANITIZE_ENCODED</code> " or " <code>FILTER_SANITIZE_SPECIAL_CHARS</code> " to transform the HTML tags and codes, the spaces and all to HTML entities and apply the encoding for these characters.</p>
<p>For more security you can use the " <code>FILTER_SANITIZE_STRING</code> " that will just return the text, if you pass a code javascript or HTML code, it will filter it and just return the text.</p>
<p>They have several common flags:</p>
<p>FILTER_FLAG_NO_ENCODE_QUOTES</p>
<p>FILTER_FLAG_STRIP_LOW</p>
<p>FILTER_FLAG_STRIP_HIGH</p>
<p>FILTER_FLAG_STRIP_BACKTICK</p>
<p>FILTER_FLAG_ENCODE_LOW</p>
<p>FILTER_FLAG_ENCODE_HIGH</p>
<p>FILTER_FLAG_ENCODE_AMP</p>
<p><img src="https://cdn.steemitimages.com/DQmW179AnCDG4MyzHdJRP9Lu4HmNYd34EqSY1gtvFueNmnn/3.jpg" width="977" height="554"/></p>
<p>The effect of the special characters will be in the source code&nbsp;</p>
<p><img src="https://cdn.steemitimages.com/DQmbNKx6fv59Ki3BCg7jXtJbCQrrdvyXxXUote8iQboR1S2/capture-20190321-161927.png" width="917" height="32"/></p>
<h2>Video Tutorial</h2>
<p>https://www.youtube.com/watch?v=q96dlRLhm6E&amp;feature=youtu.be</p>
<h2>Curriculum</h2>
<ul>
  <li><a href="https://steemit.com/utopian-io/@alexendre-maxim/php-tutorial-11-string-methods-addslaches-chr-chop-and-chunksplite">PHP Tutorial #11 String Methods ( Addslaches, Chr, Chop and Chunk_splite )</a></li>
  <li><a href="https://steemit.com/utopian-io/@alexendre-maxim/php-tutorial-12-string-methods-bin2hex-countchars-explode-and-hex2bin">PHP Tutorial #12 String Methods ( Bin2Hex, Count_Chars, Explode and Hex2Bin )</a></li>
  <li><a href="https://steemit.com/utopian-io/@alexendre-maxim/php-tutorial-13-string-methods-implode-join-lcfirst-ltrim-and-fprintf">PHP Tutorial #13 String Methods (Implode, Join, Lcfirst, Ltrim and Fprintf )</a></li>
  <li><a href="https://steemit.com/utopian-io/@alexendre-maxim/php-tutorial-14-string-methods-md5file-md5-nl2br-and-addcslaches">PHP Tutorial #14 String Methods (Md5_File, Md5, Nl2br and Addcslaches )</a></li>
  <li><a href="https://steemit.com/utopian-io/@alexendre-maxim/php-tutorial-15-string-methods-numberformat-ord-parsestr-print-and-printf">PHP Tutorial #15 String Methods (Number_Format, Ord, Parse_Str, Print and Printf )</a></li>
  <li><a href="https://steemit.com/utopian-io/@alexendre-maxim/php-tutorial-16-string-methods-quotemeta-rtrim-sha1file-and-sha1">PHP Tutorial #16 String Methods (QuoteMeta, Rtrim , Sha1_file and Sha1 )</a></li>
  <li><a href="https://steemit.com/utopian-io/@alexendre-maxim/php-tutorial-17-mathematical-methods-abs-acos-acosh-and-asin">PHP Tutorial #17 Mathematical Methods (Abs, Acos , Acosh and Asin )</a></li>
  <li><a href="https://steemit.com/utopian-io/@alexendre-maxim/php-tutorial-18-get-and-post-methods-and-usdserver-variables">PHP Tutorial #18 ( GET and POST ) Methods and $_SERVER Variables</a></li>
  <li><a href="https://steemit.com/utopian-io/@alexendre-maxim/php-tutorial-19-include-and-require-globals-variable-request-and-usdserver-variables">PHP Tutorial #19 ( Include and Require ) , Globals Variable, Request and $_SERVER Variables</a></li>
  <li><a href="https://steemit.com/utopian-io/@alexendre-maxim/php-tutorial-20-the-cookie-how-to-create-modify-and-delete-a-cookie">PHP Tutorial #20 The Cookie How To Create , Modify And Delete A Cookie</a></li>
  <li><a href="https://steemit.com/utopian-io/@alexendre-maxim/php-tutorial-21-the-session-how-to-create-modify-and-delete-a-session">PHP Tutorial #21 The Session How To Create , Modify And Delete A Session</a></li>
  <li><a href="https://steemit.com/utopian-io/@alexendre-maxim/php-tutorial-22-the-outputbuffer-and-how-to-control-it">PHP Tutorial #22 The Output_Buffer And How To Control It</a></li>
  <li>&nbsp;<a href="https://steemit.com/utopian-io/@alexendre-maxim/php-tutorial-23-filters-part-1-filtervalidate">PHP Tutorial #23 Filters Part 1 " FILTER_VALIDATE "</a></li>
</ul>
<h2>Proof of Work Done</h2>
<p>https://github.com/alexendre-maxim/PHP-Tutorial/blob/master/sanitize.html</p>
<p>https://github.com/alexendre-maxim/PHP-Tutorial/blob/master/sanitize.php</p>
</html>

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@channel64 · Mar 22 '19

Great post! I invite you to watch the last video on [channel54](https://steemit.com/programming/@channel64/developing-kubernetes-services-at-airbnb-scale-melanie-cebul)

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@alexendre-maxim · Mar 29 '19

Thank you for your invetation@channel64

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@rosatravels · Mar 23 '19

$12.48

Hi @alexendre-maxim

Thank you for your contribution to the video category.

I see that you try to write better post.  Sometimes it is difficult for people whose English is their second language.  

Try to write simple sentences.  This will help to make your text flow in the tutorial.

Again, your deliverance in the video tutorial is improving.

Your contribution has been evaluated according to [Utopian policies and guidelines](https://join.utopian.io/guidelines), as well as a predefined set of questions pertaining to the category.

To view those questions and the relevant answers related to your post, [click here](https://review.utopian.io/result/9/2-2-2-2-2-2-1-2-3-).

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👍 utopian-io, mightypanda, amosbastian, jaff8, espoem, yuxi, ulockblock, codingdefined, reazuliqbal, alexendre-maxim, ascorphat, cleanit

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@alexendre-maxim · Mar 29 '19

Thank you @rosatravels, I will try to put more detailed and precise sentences.

properties (22)

@utopian-io · Mar 26 '19

Thank you for your review, @rosatravels! Keep up the good work!

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@steem-ua · Mar 23 '19

#### Hi @alexendre-maxim!

Your post was upvoted by @steem-ua, new Steem dApp, using UserAuthority for algorithmic post curation!
Your post is eligible for our upvote, thanks to our collaboration with @utopian-io!
**Feel free to join our [@steem-ua Discord server](https://discord.gg/KpBNYGz)**

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@alexendre-maxim · Mar 29 '19

Thank you @steem-ua

properties (22)

@utopian-io · Mar 23 '19

Hey, @alexendre-maxim!

**Thanks for contributing on Utopian**.
We’re already looking forward to your next contribution!

**Get higher incentives and support Utopian.io!**
 Simply set @utopian.pay as a 5% (or higher) payout beneficiary on your contribution post (via [SteemPlus](https://chrome.google.com/webstore/detail/steemplus/mjbkjgcplmaneajhcbegoffkedeankaj?hl=en) or [Steeditor](https://steeditor.app)).

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@alexendre-maxim · Mar 29 '19

Thank you

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