PHP Startup Unable to load dynamic library

General Tech Bugs & Fixes 2 years ago

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manpreet Tuteehub forum best answer Best Answer 2 years ago

 

I'm getting this error in my apache error log while trying to get cURL to work on PHP:

PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib/php5/20121212/curl.so' - /usr/lib/php5/20121212/curl.so: symbol curl_easy_pause, version CURL_OPENSSL_3 not defined in file libcurl.so.4 with link time reference in Unknown on line 0

The file it references is there in that location and I'm trying to figure out if I've missed any dependancies while installing curl for PHP. There are no errors when I use curl -V on the command line.

I've tried the following commands:

sudo apt-get install php5-curl
sudo apt-get update
sudo apt-get install openssl

I've also tried removing php completely and installing it from scratch using the following command:

sudo apt-get install php5-common libapache2-mod-php5 php5-cli

Then after:

sudo apt-get install php5-curl

What am I missing here?

My software versions:

PHP 5.5.9-1ubuntu4.2 (cli) (built: Jun 25 2014 17:17:37) 
curl 7.16.0 (x86_64-unknown-linux-gnu) libcurl/7.16.0
Ubuntu 14.04

Thanks in advance

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manpreet 2 years ago

In your system are installed two different version of libcurl:

  • libcurl3.so that is a symbolic link to libcurl4.so that point to libcurl.so.4.3.0

lrwxrwxrwx 1 root root 12 Apr 1 13:43 /usr/lib/x86_64-linux-gnu/libcurl.so.3 -> libcurl.so.4 lrwxrwxrwx 1 root root 16 Apr 1 13:43 /usr/lib/x86_64-linux-gnu/libcurl.so.4 -> libcurl.so.4.3.0 -rw-r--r-- 1 root root 422696 Apr 1 13:43 /usr/lib/x86_64-linux-gnu/libcurl.so.4.3.0

  • a local version of libcurl.so.4 that is a link to libcurl.so.4.0.0

lrwxrwxrwx 1 root root 16 Jun 18 09:26 /usr/local/lib/libcurl.so.4 -> libcurl.so.4.0.0 -rwxr-xr-x 1 root root 1146079 Jun 18 09:26 /usr/local/lib/libcurl.so.4.0.0

This local library /usr/local/lib/libcurl.so.4 is loaded before /usr/lib/x86_64-linux-gnu/libcurl.so.4. We can see ld library order using command strings /etc/ld.so.cache.

As I can see in find / -name "*libcurl*" -exec ls -l {} \; -print output, you installed a source package of libcurl-7.16.0 in /usr/local/src/curl-7.16.0/ and I guess you compiled and generated /usr/local/lib/libcurl.so.4.0.0.

The missing method curl_easy_pause is present in libcurl since 7.18.0 and that's why I got the error, your system is using libcurl-7.16.0.

In order to fix this issue, remove wrong libcurl and update ld.so cache:

     sudo rm /usr/local/lib/libcurl*
     sudo ldconfig -v

I suggest to remove /usr/local/src/curl-7.16.0 directory to prevent any other kind of problem.


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