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PO$_GET and $_POST issue
 

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    <p>The following is my problem (example code)..</p> <p>If I perform this:</p> <pre><code>$rf = $_GET['_id']; if($_POST['form']){ echo "ref: " . $rf; } </code></pre> <p><code>$rf</code> is blank during <code>if($_POST['form'])</code> </p> <p>Now, If I perform this:</p> <pre><code>$rf = "123456"; if($_POST['form']){ echo "ref: " . $rf; } </code></pre> <p><code>$rf</code> is displayed</p> <p>Why is it blank the first time and not blank if I assign something static to the $rf var? Also how can I fix this so the first solution works?</p> <p>Thanks!</p> <p>Note: don't worry about SQL injections.. I have already stripped everything from "_id".</p> <p><strong>Complete PHP and HTML</strong></p> <pre><code>&lt;?php require "includes/connect.php"; //var_dump($_GET);die; function gen_code($codeLen = 7) { $code = ''; for ($i=0; $i&lt;$codeLen; $i++) { $d=rand(1,30)%2; $code .= $d ? chr(rand(65,90)) : chr(rand(48,57)); } return $code; } function add_code($email_id) { global $mysqli; $code = gen_code(7); $mysqli-&gt;query("UPDATE coming_soon_emails SET code='" . $code ."' WHERE email_id='" . $email_id . "'"); if($mysqli-&gt;affected_rows != 1) { add_code($email_id); } else return $code; } $msg = ''; $referrer = $_GET['_url']; // echo $referrer displays the referrer ID contents correctly if ( ! empty($referrer)) { $mysqli-&gt;query("UPDATE coming_soon_emails SET clicks = clicks + 1 WHERE code='" . $referrer ."'"); } if (!empty($_POST['email'])){ // Requested with AJAX: $ajax = ($_SERVER['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest'); try{ if(!filter_input(INPUT_POST,'email',FILTER_VALIDATE_EMAIL)){ throw new Exception('Invalid Email!'); } $mysqli-&gt;query("INSERT INTO coming_soon_emails SET email='".$mysqli-&gt;real_escape_string($_POST['email'])."'"); if($mysqli-&gt;affected_rows != 1){ throw new Exception('This email already exists in the database.'); } else { $email_code = add_code($mysqli-&gt;insert_id); } $msg = "http://www.my-url/" . $email_code; //the following doesn't work as referrer is now empty :( if ( ! empty($referrer)) { $mysqli-&gt;query("UPDATE coming_soon_emails SET signup = signup + 1 WHERE code='" . $referrer ."'"); } if($ajax){ die(json_encode(array('msg' =&gt; $msg))); } } catch (Exception $e){ if($ajax){ die(json_encode(array('error'=&gt;$e-&gt;getMessage()))); } $msg = $e-&gt;getMessage(); } } ?&gt; &lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;meta http-equiv="Content-Type" content="text/html; charset=utf-8" /&gt; &lt;title&gt;&lt;/title&gt; &lt;link rel="stylesheet" type="text/css" href="css/styles.css" /&gt; &lt;/head&gt; &lt;body&gt; &lt;div id="launch"&gt; &lt;form id="form" method="post" action=""&gt; &lt;input type="text" id="email" name="email" value="&lt;?php echo $msg;?&gt;" /&gt; &lt;input type="submit" value="Submit" id="submitButton" /&gt; &lt;/form&gt; &lt;div id="invite"&gt; &lt;p style="margin-top:20px;"&gt;The ID of who referred you: &lt;?php echo $referrer; //this displays correctly?&gt;)&lt;/p&gt; &lt;p style="margin-top:20px;"&gt;&lt;span id="code" style="font-weight:bold;"&gt;&amp;nbsp;&lt;/span&gt;&lt;/p&gt; &lt;/div&gt; &lt;/div&gt; &lt;script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.3/jquery.min.js"&gt;&lt;/script&gt; &lt;script src="js/script.js"&gt;&lt;/script&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p><strong>script.js</strong></p> <pre><code>$(document).ready(function(){ // Binding event listeners for the form on document ready $('#email').defaultText('Your Email Address'); // 'working' prevents multiple submissions var working = false; $('#form').submit(function(){ if(working){ return false; } working = true; $.post("./index.php",{email:$('#email').val()},function(r){ if(r.error){ $('#email').val(r.error); } else { $('#email').val(r.msg); } working = false; },'json'); return false; }); }); // A custom jQuery method for placeholder text: $.fn.defaultText = function(value){ var element = this.eq(0); element.data('defaultText',value); element.focus(function(){ if(element.val() == value){ element.val('').removeClass('defaultText'); } }).blur(function(){ if(element.val() == '' || element.val() == value){ element.addClass('defaultText').val(value); } }); return element.blur(); } </code></pre>
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    1. COAre you having _id be set to anything during $_POST['form']? This seems that you are just not setting the $_GET variable in the URL.
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    2. COWhat happens if you echo `$_GET['_id']` as the first line in that code? Is anything shown?
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    3. COHow about removing the references to $_POST['form'] as they are clearly not relevant?
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      1. USTeo Klestrup Röijezon
 

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