What should I do if php cannot display the verification code image?

The solution to the problem that php cannot display images is to add the code as [ob_clean(); header("Content-type:image/jpeg");] before the header output and save it.

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PHP verification code image cannot be displayed problem

I thought the gd2 library was not opened, but I checked with phpinfo and found that it was opened.

Solution

Add before the header output:

ob_clean(); //Key code to prevent the problem of 'the image cannot be displayed because of its own errors'.

header("Content-type:image/jpeg");

Example:

private function outPut() {
        ob_clean();  //关键代码，防止出现'图像因其本身有错无法显示'的问题。
        header('Content-type:image/png');
        imagepng($this->img);
        imagedestroy($this->img);
    }

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