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wordpress版本：wordpress:4.9.8版本php版本：v7.2.12dockcer镜像为：wordpress:4.9.8
图形验证码加载不出来
最近利用wordpress建站的时候，用到了wechat-social-login插件实现微信、QQ、钉钉、Github登陆功能时，开启图形验证码功能后，看到图形二维码一直加载不出来，F12看到状态码为200，但没有返回值，报错This request has no response data available
打开wordpress日志后，发现debug日志文件中报以下的错误。开启debug日志方法请移步历史文章如何开启WordPress调试模式(报错提示)，将日志打印到wp-content目录下的debug.log中。
[08-Feb-2020 07:37:42 UTC] PHP Fatal error: Uncaught Error: Call to undefined function Gregwar\Captcha\imagettfbbox() in /var/www/html/wp-content/plugins/wechat-social-login/includes/captcha/CaptchaBuilder.php:327
Stack trace:
#0 /var/www/html/wp-content/plugins/wechat-social-login/includes/captcha/CaptchaBuilder.php(440): Gregwar\Captcha\CaptchaBuilder->writePhrase(Resource id #7, '84sx', '/var/www/html/w...', 150, 40)
#1 /var/www/html/wp-content/plugins/wechat-social-login/includes/social/class-xh-social-ajax.php(203): Gregwar\Captcha\CaptchaBuilder->build()
#2 /var/www/html/wp-content/plugins/wechat-social-login/includes/social/class-xh-social-ajax.php(209): XH_Social_Ajax::{closure}()
#3 /var/www/html/wp-includes/class-wp-hook.php(286): XH_Social_Ajax::captcha('')
#4 /var/www/html/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters('', Array)
#5 /var/www/html/wp-includes/plugin.php(453): WP_Hook->do_action(Array)
#6 /var/www/html/wp-admin/admin-ajax.php(99): do_action('wp_ajax_xh_soci...')
#7 {main}
thrown in /var/www/html/wp-content/plugins/wechat-social-login/includes/captcha/CaptchaBuilder.php on line 327登录后复制
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