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Sanitizing Input


EmmanuelP89

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Hi i'm fairly new to PHP and have been going through Learning PHP, MySQL, Javascript and CSS by Robin Nixon 2nd edition and found the following problem in the following example that I could not figure out.
I would appreciate any help to fixing it. Thanks
 
 
 
<!DOCTYPE html>
<!--
To change this license header, choose License Headers in Project Properties.
To change this template file, choose Tools | Templates
and open the template in the editor.
-->
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
    </head>
    <body>
        <?php
            /* 
             * 
             */
        
        $f = $c = "";
        
        if (isset($_POST['f'])) 
        {
            $f = sanitizeString($_POST['f']);
        }
        if (isset($_POST['c'])) 
        {
            $c = sanitizeString($_POST['c']);
        }
 
        // degree symbol done by alt + 0176
        if ($f != '')
        {
            $c = intval((5 / 9) * ($f - 32));
            $out = "$f °f equals $c °c";
        }
        elseif($c != '')
        {
            $f = intval((9 / 5) * $c + 32);
            $out = "$c °c equals $f °f";
        }
        else 
        {
            $out = "";
        }
        
        echo <<<_END
        <html>
            <head>
                <title>Temprature Converter</title>
            </head>
            <body>
                <pre>
            Enter either Fahrenheit or Celsius and click Convert
                
            <b>$out</b>
            <form method="post" action="convert.php">
            Fahrenheit  <input type="text" name="f" size="7" />
               Celsius  <input type="text" name="c" size="7" />
                        <input type="submit" value="Convert" />
            </form>    
                </pre>
            </body>
        </html>
_END;
        
        function sanitizeString($var)
        {
            $var = stripslashes($var);
            $var = htmlentitites($var);
            $var = strip_tags($var);
            return $var;
        }
        
        ?>
    </body>
</html>
 
 
*****************************************************************************************************
 
This is what happens after running the converter
 
 
( ! ) Fatal error: Call to undefined function htmlentitites() in C:\wamp\www\Chapter10\Chapter11\convert.php on line 68 Call Stack # Time Memory Function Location 1 0.0004 260784 {main}( ) ..\convert.php:0 2 0.0004 261616 sanitizeString( ) ..\convert.php:22
 

 

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