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POprevent array in string field - XSS
 

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    <p>I'm having trouble analyzing input forms...<br> I will give three examples , both taking into account the change of the form 'User'</p> <hr> <pre><code>&lt;form method="POST" action="#"&gt; &lt;input type="text" name="first_name" value="Albert"&gt; &lt;input type="text" name="last_name" value="Einstein"&gt; &lt;/form&gt; </code></pre> <p><sup>original fields unchanged, get the data:<br> $_POST = array( 'first_name' => 'Albert' , 'last_name' => 'Einstein' )</sup></p> <hr> <pre><code>&lt;form method="POST" action="#"&gt; &lt;input type="text" name="first_name[]" value="Albert"&gt; &lt;input type="text" name="last_name[]" value="Einstein"&gt; &lt;/form&gt; </code></pre> <p><sup>adulterated fields, I get the data:<br> $_POST = array( 'first_name' => array( Albert ) , 'last_name' => array( Einstein ) )</sup></p> <hr> <pre><code>&lt;form method="POST" action="#"&gt; &lt;input type="text" name="first_name[]" value="Albert"&gt; &lt;input type="text" name="first_name[]" value="Einstein"&gt; &lt;/form&gt; </code></pre> <p><sup>adulterated fields, I get the data:<br> $_POST = array( 'first_name' => array( Albert , Einstein ) , 'last_name' => null )</sup></p> <hr> <ol> <li><p>I check if the field is of a type expected even before dealing with the 'class Validate'?<br> field_X if a string is as expected and I get an array , I mark it as a mistake or get the first element of the array?</p></li> <li><p>If I receive an array into a string field that must be how I'll fill out the form with the data sent ?<br> If I complete the field with <code>$_POST['XXX']</code> appears <code>Array</code></p></li> </ol> <p><br> I hope I have been clear since it is a real problem<br> Tanks to all</p>
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