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copied!<ol> <li><p><a href="http://php.net/language.operators.logical" rel="nofollow noreferrer"><code>OR</code></a> is the same as <code>||</code> except that <code>OR</code> has a lower <a href="http://php.net/language.operators.precedence" rel="nofollow noreferrer">precedence</a> than <code>||</code>. This can cause logical errors when it’s used with other operators with a higher precedence than <code>OR</code> but a lower precedence than <code>||</code> like the assignment operators:</p> <pre><code>$var = false OR true; // ($var = false) OR true; var_dump($var); // bool(false) $var = false || true; // $var = (false || true); var_dump($var); // bool(true) </code></pre> <p>So I recommend you to rather use <code>||</code> than <code>OR</code>.</p></li> <li><p><a href="http://php.net/die" rel="nofollow noreferrer"><code>die</code></a> does print the passed string and quits the execution of the current script. Personally, I wouldn’t use use <code>die</code> but implement a more decent error handling like storing the error message in a variable and print it in the document like this:</p> <pre><code>$errors = array(); if (!empty($_POST)) { if ($pass!="d41d8cd98f00b204e9800998ecf8427e" || $user!="") { $result=mysql_query($sql); if (mysql_error()) { $errors[] = 'Sorry, this username already exists'; } } else { $errors[] = "Please enter the Password"; } } if (!empty($errors)) { echo 'There were some errors:'; echo '<ul><li>', implode('</li><li>', $errors), '</li></ul>'; } </code></pre></li> <li><p>If you use an empty URL for the <code>action</code> attribute, it refers to the very same URL:</p> <pre><code><form name="form1" method="post" action=""> </code></pre></li> </ol> <p>Some further tips:</p> <ul> <li>Use <code>$_SERVER['REQUEST_METHOD'] === 'POST'</code> to test the request method instead of testing <code>!empty($_POST)</code>.</li> <li>Avoid <a href="http://php.net/security.globals" rel="nofollow noreferrer">register globals</a>. So use <code>$_POST['pass']</code> instead of <code>$pass</code> if you want to refer to the parameter <em>pass</em> passed by POST.</li> </ul>

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