yii verification code cannot be displayed

No display: (Recommended learning: yii tutorial )

## First guarantee your controler The captcha method inside is accessible and assigned permissions, which are set in the rule.

Second, ensure that your PHP GD plug-in has been enabled

Third, if it still does not display, then try this method , someone else told me.

Solution: First find yii\framework\web\widgets\captcha\CCaptchaAction.php, you can try the following methods to solve it:

1 Try to delete the spaces in the text

2 Add error_reporting(0) at the top of the php file;

3 Add ob_clean(); before the header output; that is:

ob_clean();//加上这行

header('Pragma: public'); 
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0'); 
header('Content-Transfer-Encoding: binary'); 
header("Content-type: image/png"); 
imagepng($image);
imagedestroy($image);

The above is the detailed content of yii verification code cannot be displayed. For more information, please follow other related articles on the PHP Chinese website!