What should I do if the yii verification code does not come out?

#yii What should I do if the verification code does not come out? Regarding the problem that the verification code function of yii2 does not display

1, the verification code does not display:

First ensure that the captcha method in your controller is accessible and has the assigned permissions Yes, this is set in the rule.

Second, make sure your PHP GD plug-in has been enabled.

Third, if it still doesn’t 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);

3 at the top of the php file. 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);

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