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I have a mistake and I’m trying to correct but I can’t, can anyone help me? Thank you.
The mistake is: Notice: Undefined index: referrer in C: xampp htdocs brpg register_content.php on line 71
the file "register_content.php" is:
<html>
<link href="css/login-form.css" type="text/css" rel="stylesheet" />
<div id="reg_top">
<table align="center">
<tr>
<td>
<h2>Register a new account</h2>
<p>We are glad you have considered to be a new member and a part of our community and we wish you a wonderful experience here!<br>
Please enter the details for your new account below.</p>
<p><i>Please note that, we do not allow multiple accounts per user and you are hereby creating an MTA game account.</i></p>
</td>
</tr>
</table>
</div>
<div id="reg_mid">
<form id="register_form" onsubmit="ajax_submit_register();
return false;" method="post" action="" onkeypress="resetError();">
<br>
<table align="center" class="login-form" style="width: 650px;" cellpadding="2">
<tr>
<td style="text-align: left;">
<b>Username: </b>
</td>
<td style="text-align: left;">
<input type="text" id="reg_username" placeholder="" maxlength="30" required/>
</td>
<td rowspan="5" valign="bottom" style="text-align: left;">
<div style="margin-left: 20px;">
<b>Prove you're human:</b>
<br>
<a href="" onclick="ajax_reload_captcha();
return false;"><div id="img_captcha"><img src="captcha/captcha.php" /></div></a><br>
<input type="text" id="reg_captcha" placeholder="Enter the text above" maxlength="5" required style="width: 146px;" />
</div>
</td>
</tr>
<tr>
<td style="text-align: left;">
<b>Password: </b>
</td>
<td style="text-align: left;">
<input type="password" id="reg_password1" placeholder="" maxlength="50" min="6" required/>
</td>
</tr>
<tr>
<td style="text-align: left;">
<b>Re-type Password: </b>
</td >
<td style="text-align: left;">
<input type="password" id="reg_password2" placeholder="" maxlength="50" min="6" required/>
</td>
</tr>
<tr>
<td style="text-align: left;">
<b>Email Address: </b>
</td>
<td style="text-align: left;">
<input type="email" id="reg_email" placeholder="" maxlength="200" min="1" required/>
</td>
</tr>
<tr>
<td style="text-align: left;">
<b>Referrer: </b>
</td>
<td style="text-align: left;">
<?php
$referrer = strip_tags($_GET['referrer']);
?>
<input type="text" id="reg_referrer" placeholder="Person who invited you" maxlength="30" value="<?php if ($referrer) echo $referrer; ?>" />
</td>
</tr>
<tr>
<td colspan="3">
<center>
<br>
<input type="checkbox" id="terms" required/> I have read and agreed to the <a href="http://forums.owlgaming.net/forumdisplay.php?366-Rules" target="_blank">terms and conditions</a>.<br>
<input type="submit" id="submit_reg" value="Register" style="margin-top: 20px; "/>
</center>
</td>
</tr>
<tr>
<td colspan="3">
<div id="error_reg" style="padding-top: 10px; color:red;font-style: italic;font-size: 11px;"></div>
</td>
</tr>
<tr>
<td align="center" colspan="3">
<div id="reg_status"></div>
</td>
</tr>
</table>
</form>
</div>
<div id="reg_bot">
</div>
<script type="text/javascript" src="js/ajax_register.js"/></script>
</html>
