CODEWITHSUNDEEP
phpapachegoogle-chromecaptcha
khaled_webdev
khaled_webdev

Reputation: 1430

Failed to generate captcha image, content has already been output

i m using secureimage solution to generate captcha code

i have this error on chrom console

Resource interpreted as Image but transferred with MIME type text/html

and when entring on this url directly used as image src

securimage_show.php?sid=fa5e1eb19c3a534885632e

i have this error

Failed to generate captcha image, content has already been output. This is most likely due to misconfiguration or a PHP error was sent to the browse

someone have idea ?

Note: it works for me in localhost wampserver but not on remote server

Edit:

the code from the captcha opensource code generating php errors :

 protected function output()
{
    if ($this->canSendHeaders() || $this->send_headers == false) {
        if ($this->send_headers) {
            // only send the content-type headers if no headers have been output
            // this will ease debugging on misconfigured servers where warnings
            // may have been output which break the image and prevent easily viewing
            // source to see the error.
            header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
            header("Last-Modified: " . gmdate("D, d M Y H:i:s") . "GMT");
            header("Cache-Control: no-store, no-cache, must-revalidate");
            header("Cache-Control: post-check=0, pre-check=0", false);
            header("Pragma: no-cache");
        }

        switch ($this->image_type) {
            case self::SI_IMAGE_JPEG:
                if ($this->send_headers) header("Content-Type: image/jpeg");
                imagejpeg($this->im, null, 90);
                break;
            case self::SI_IMAGE_GIF:
                if ($this->send_headers) header("Content-Type: image/gif");
                imagegif($this->im);
                break;
            default:
                if ($this->send_headers) header("Content-Type: image/png");
                imagepng($this->im);
                break;
        }
    } else {
        echo '<hr /><strong>'
            .'Failed to generate captcha image, content has already been '
            .'output.<br />This is most likely due to misconfiguration or '
            .'a PHP error was sent to the browser.</strong>';
    }

    imagedestroy($this->im);
    restore_error_handler();

    if (!$this->no_exit) exit;
}

Upvotes: 0

Views: 3543

Answers (4)

Bora Erbasoglu
Bora Erbasoglu

Reputation: 107

Quick Fix:

Just replace canSendHeaders function in securimage.php file

From

protected function canSendHeaders() {

    if (headers_sent()) {

        // output has been flushed and headers have already been sent
        return false;
    } else if (strlen((string) ob_get_contents()) > 0) {
        // headers haven't been sent, but there is data in the buffer that will break image and audio data
        return false;
    }

    return true;
}

To 

protected function canSendHeaders() {

    ob_get_clean();

    if (headers_sent()) {

        // output has been flushed and headers have already been sent
        return false;
    } else if (strlen((string) ob_get_contents()) > 0) {
        // headers haven't been sent, but there is data in the buffer that will break image and audio data
        return false;
    }

    return true;
}

Upvotes: 4

stephan
stephan

Reputation: 1

had the same problem this morning with a development that i've done some month ago, while deploying today i've forgotten that i place an echo on the top of securimage.php, hope this can help

Upvotes: 0

SoftBuilders Pk
SoftBuilders Pk

Reputation: 109

Failed to generate captcha image, content has already been output. This is most likely due to misconfiguration or a PHP error was sent to the browse

I think you are missing reference to the dll in your web.config

Upvotes: 0

jeroen
jeroen

Reputation: 91734

Judging by this statement that evaluates to false:

if ($this->canSendHeaders() || $this->send_headers == false) {

you have already sent stuff to the browser before you call the output function.

In order to be able to use that function, you must make sure that nothing has been sent to the browser; no empty lines or spaces before opening <?php tags, no echo statements, etc.

Upvotes: 0

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