CCaptcha displaying no image yii

Question

I have a user registration form, in which I am trying to display a Captcha image by using Yii widget CCaptcha, however my image link appears broken, Controller file:

Answer 1

Yii captcha will create a png image. A possible explanation for the broken image link would be a missing GD extension or imagick extension, which can be identified by the presence of the following text in your error.log:

call to undefined function imagecreatetruecolor

For details and fix see "call to undefined function imagecreatetruecolor" error in PHP & pChart