Updated cURL not taking effect in PHP

Question

I have an application running through Docker, based on the official PHP Docker image.

I've extended it to update cURL and get it working with nghttp2 and openssl, which is what I need for HTTP/2 support in my application.

However, PHP itself isn't reflecting the change, and I don't know why.

Here's my Dockerfile:

FROM php:7.0.3-fpm

# Add sources that allow installation of unstable packages (needed for latest OpenSSL/cURL versions).
RUN echo 'deb http://ftp.uk.debian.org/debian testing main contrib \n\
deb-src http://ftp.uk.debian.org/debian testing main contrib \n\
deb http://ftp.debian.org/debian/ jessie-updates main contrib \n\
deb-src http://ftp.debian.org/debian/ jessie-updates main contrib \n\
deb http://security.debian.org/ jessie/updates main contrib \n\
deb-src http://security.debian.org/ jessie/updates main contrib' > /etc/apt/sources.list \
&& apt-get update

# Install OpenSSL, nghttp2 and cURL (required to make HTTP/2 requests).
RUN apt-get install -y openssl nghttp2 curl

# Install other dependencies.
RUN apt-get install -y \
    libfreetype6-dev \
    libjpeg62-turbo-dev \
    libmcrypt-dev \
    libpng12-dev \
&& docker-php-ext-install pdo_mysql mbstring sockets zip bcmath \
&& docker-php-ext-configure gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/ \
&& docker-php-ext-install gd

# Copy custom PHP.ini
COPY php.ini /usr/local/etc/php/

# Run php-fpm.
CMD ["php-fpm"]

curl --version outputs:

curl 7.47.0 (x86_64-pc-linux-gnu) libcurl/7.47.0 GnuTLS/3.4.9 zlib/1.2.8 libidn/1.29 libssh2/1.4.3 nghttp2/1.7.1 librtmp/2.3
Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtmp rtsp scp sftp smb smbs smtp smtps telnet tftp 
Features: AsynchDNS IDN IPv6 Largefile GSS-API Kerberos SPNEGO NTLM NTLM_WB SSL libz TLS-SRP HTTP2 UnixSockets

openssl version outputs:

OpenSSL 1.0.2f  28 Jan 2016

However, php -i outputs:

curl

cURL support => enabled
cURL Information => 7.38.0
Age => 3
Features
AsynchDNS => Yes
CharConv => No
Debug => No
GSS-Negotiate => No
IDN => Yes
IPv6 => Yes
krb4 => No
Largefile => Yes
libz => Yes
NTLM => Yes
NTLMWB => Yes
SPNEGO => Yes
SSL => Yes
SSPI => No
TLS-SRP => Yes
HTTP2 => No
GSSAPI => Yes
Protocols => dict, file, ftp, ftps, gopher, http, https, imap, imaps,     ldap, ldaps, pop3, pop3s, rtmp, rtsp, scp, sftp, smtp, smtps, telnet, tftp
Host => x86_64-pc-linux-gnu
SSL Version => OpenSSL/1.0.1k
ZLib Version => 1.2.8
libSSH Version => libssh2/1.4.3

Note that cURL Information shows the wrong curl version number, and HTTP2 is marked as no.

Any suggestions on how to get PHP to pick this up would be greatly appreciated!

Answer 1

For anyone who wonders about this in the future, I did find a way to do it in the end. I basically created my own Docker image, heavily based on the official PHP one, that downloaded the newer version of cURL before compiling.

It's available on Docker hub (for PHP 7 running via FPM, at least).