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    <p>To change hash function, if only '+' is the problem you may keep a check while creating the string,</p> <pre><code>next_char = Randomly-created-char; if(next_char == '+'){ //do nothing } else{ hash .= next_char; } </code></pre> <p>Here is how the html and php files should be like.</p> <p>The ajax call is shown in the .html file.</p> <p><strong>.php that loads your form for the first time.</strong></p> <pre><code>&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"&gt;&lt;/script&gt; &lt;script type="text/javascript"&gt; $(document).ready(function(){ $("#check").click(function(){ $("#keyvalue").text($("#key").val()); }); $("#submit").click(function(){ var text = $("#text").val(); var key = $("#key").val(); $.ajax({ url: 'trial.php', data: {text: text, key:key}, type: 'POST', dataType: 'json', success: function(data) { if(data.status == "fail"){ $("#status").html(data.message); }else{ $("#status").html(data.message); $("#key").val(data.key); $("#keyvalue").text(''); } } }); return false; }); }); &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;form method="post" action="trial.php" onsubmit="return send_form();"&gt; &lt;input type="text" name="text" id="text"/&gt; &lt;input type="hidden" id="key" name="key" value="&lt;?php echo $key?&gt;"/&gt; //Look here. &lt;button id="submit"&gt;Send data and get new key&lt;/button&gt; &lt;/form&gt; &lt;br&gt;&lt;br&gt; &lt;div id="status"&gt;&lt;/div&gt; &lt;br&gt;&lt;br&gt; &lt;button id="check"&gt;What's current value of key?&lt;/button&gt; --------&gt; &lt;span id="keyvalue"&gt;&lt;/span&gt; &lt;div id="response"&gt;&lt;/div&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>.php</p> <pre><code>&lt;?php //You get the form contents here. $key = isset($_POST['key']) ? $_POST['key'] : "error"; $text = isset($_POST['text']) ? $_POST['text'] : "empty"; //Check them if it matches with DB's entry, if doesn't you set $key = "error"; if($key=="error"){ $status = "fail"; $message = "There was some error processing your form."; exit; } else{ //You generate another random key. $random =''; for ($i = 0; $i &lt; 10; $i++) { $random .= chr(mt_rand(33, 126)); } //Now here in steps save it to your DB. So that when next form is submitted you can match it. //And send back response to html file, where ajax will refresh the key. $status = "success"; $message = " Your form was processed succesfully&lt;br&gt; The text you sent was ".$text.", and the key you sent was ".$key.". The new key sent to you can be seen by pressing the button below, has value, ".$random."&lt;br&gt;&lt;br&gt; "; } echo json_encode(array("status" =&gt; $status, "message" =&gt; $message, "key" =&gt; $random)); ?&gt; </code></pre> <p>Hope this helps you.</p> <p>While generating the form for the first time, you have to give the key and nonce without any ajax, the ajax function will be called when this following keys have been used.</p> <pre><code>echo "&lt;input type='hidden' id='key' name='key' value='".$key."'&gt;"; echo "&lt;input type='hidden' id='nonce' name='nonce' value='".$nonce."'&gt;"; </code></pre>
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    1. POnonce token after ajax response and hash problems using ajax jquery type json
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    1. COHere I added what you can do to not have '+' in your hash key.
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    2. COHere I edited the answer.
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