Why is PHP throwing \"Unable to Load Dynamic Library\" errors and how can I fix it?

Error in PHP5: Unable to Load Dynamic Library

When executing PHP with the -a option, you may encounter errors similar to the following:

PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php5/20090626+lfs/curl.so' - /usr/lib/php5/20090626+lfs/curl.so: cannot open shared object file: No such file or directory in Unknown on line 0

Explanation

These errors occur when PHP attempts to load dynamic libraries (extensions) that are not installed or cannot be found. The specific extensions being mentioned in the error include curl, mcrypt, mysql, mysqli, pdo, and pdo_mysql.

Solution

Installing the necessary extensions may seem like the immediate solution, but it is not advisable as it can lead to unnecessary dependencies. Instead, it is recommended to disable PHP from attempting to load these extensions:

1. Identify Loading Files:

$ grep -Hrv ";" /etc/php5 | grep -E "extension(\s+)?="

This command will output a list of files that are attempting to load the problematic extensions.

2. Disable Extensions:

Locate the files that are loading the extensions that cause the errors. For each file, comment out the lines that attempt to load the missing extensions by adding a semicolon (;) at the beginning of the line.

Example for Ubuntu:

/etc/php5/mods-available/curl.ini: ;extension=curl.so

Conclusion

Disabling unnecessary extensions addresses the error while avoiding the introduction of potential dependencies. By identifying and commenting out lines that attempt to load missing extensions, you can prevent PHP from displaying these errors.

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