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i have implemented the frontend form, which enables UNREGISTERED users to post on my site.

Everything in working perfectly, the only problem I have is with the implementation of the captcha.

All of the captcha solutions I found needs to put some outer file in the form action. But my form has this syntax:

<form action=""> 

I do not know what to do? If I put the file in the action field, I cannot add the post anymore. How would I put the verification code for the captcha in the same file as the form is? Or any better solution?

EDIT: How can I modify the form, that it would do the same thing (add post) as it does it now, but that I could include some file in the form action:

<form action="some.php">
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This is not WordPress related. Search for it in Stack Exchange. – brasofilo Feb 2 '13 at 22:03
I'm running this code on wordpress but I agree, after all it is more PHP oriented, you're right. – M P Feb 3 '13 at 0:55

Try Really Simple Captcha WodPress plugin. Here is a "how to" for implementing Really Simple Captcha for custom plugins: http://www.lost-in-code.com/platforms/wordpress/wordpress-plugins/wordpress-using-really-simple-captcha/

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hm, I cannot get it working! Damn... maybe because I have this wp_nounce fields? Here is my fiddle: jsfiddle.net/aqMA7 – M P Feb 2 '13 at 16:04
I use Really Simple Captcha for pretty much all my forms, it's surprisingly easy to implement. – Howdy_McGee Apr 11 '14 at 20:06

Use jQuery and first send the form content, here the captcha, to your file where the captcha is checked. Then send the form data to your posting routine.

$( '#frontend-post-form-submit' ).click(
  function(event) {
    var data = { ... insert the captcha from the form here ... };
      function( result ) {
        // stop if the captcha isn't correct
        if ( false === result.result ) {

        return result.result;

If your submit button have the id frontend-post-form-submit and the captcha isn't correct, the jQuery will stop sending the form (event.preventDefault). Else the form will be submitted normally.

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