各位版上大大 好，
小弟我使用Docker的PHP與LDAP進行連線，
查找了一番網上資源並且沿用建立Dockerfile

# Dockerfile code
FROM php:7.4-fpm
COPY ./htdocs /usr/src/myapp
WORKDIR /usr/src/myapp

RUN apt-get update 
RUN apt-get install -y libldap2-dev
RUN apt-get install -y libmemcached-dev zlib1g-dev 
RUN pecl install https://pecl.php.net/get/uploadprogress-2.0.2.tgz

RUN rm -rf /var/lib/apt/lists/*

RUN docker-php-ext-configure ldap --with-libdir=lib/x86_64-linux-gnu/ 
RUN docker-php-ext-enable uploadprogress 

RUN docker-php-ext-install mysqli ldap
RUN docker-php-ext-enable mysqli ldap

RUN apt-get purge -y --auto-remove libldap2-dev

以此image去建立Container以後，在頁面呈現上仍然無法套用Ldap的套件，
想詢問版上大神們小弟是否有哪裡有撰寫錯誤，或者有其他建議呢?

# Error msg.
Fatal error: Uncaught Error: Call to undefined function ldap_connect() in /www/index.php:15 Stack trace: #0 {main} thrown in /www/index.php on line 15

p.s.hostname, port皆沒有錯誤(已排除這個問題)