checkRequirements() public static method
Checks if there is graphic extension available to generate CAPTCHA images.
This method will check the existence of ImageMagick and GD extensions.
| public static string checkRequirements ( ) | ||
|---|---|---|
| return | string |
The name of the graphic extension, either "imagick" or "gd". |
| throws | yii\base\InvalidConfigException |
if neither ImageMagick nor GD is installed. |
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