install php imap in dockerfile

Dockerfile

FROM php:5-apache

RUN apt-get update && \
    apt-get install -y \
        libc-client-dev libkrb5-dev && \
    rm -r /var/lib/apt/lists/*
    
RUN docker-php-ext-configure imap --with-kerberos --with-imap-ssl && \
    docker-php-ext-install -j$(nproc) imap

Try this

# Enable php-imap
RUN apt-get update && \
    apt-get install -y \
        libc-client-dev libkrb5-dev && \
    rm -r /var/lib/apt/lists/*
RUN docker-php-ext-configure imap --with-kerberos --with-imap-ssl && \
    docker-php-ext-install -j$(nproc) imap

tanks very much!