Php warning: php startup: unable to load dynamic library curl so

Question

PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php/20131226/curl.so' - /usr/lib/php/20131226/curl.so: undefined symbol: zend_unset_property in Unknown on line 0

I am using Ubuntu 14.04 LTS and PHP v5.6

There are other versions in same machine php5 and php7 but php5.6 has been enabled. I tried to install cURL by

sudo apt-get install php5.6-curl

Now I am getting

Unable to load dynamic library curl.so

After running php -i | grep ini I get the following

[email protected]:/etc/php/5.6/apache2# php -i | grep ini
PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib/php/20131226/curl.so' - /usr/lib/php/20131226/curl.so: undefined symbol: zend_unset_property in Unknown on line 0
Configuration File (php.ini) Path => /etc/php/5.6/cli
Loaded Configuration File => /etc/php/5.6/cli/php.ini
Scan this dir for additional .ini files => /etc/php/5.6/cli/conf.d
Additional .ini files parsed => /etc/php/5.6/cli/conf.d/10-mysqlnd.ini,
/etc/php/5.6/cli/conf.d/10-opcache.ini,
/etc/php/5.6/cli/conf.d/10-pdo.ini,
/etc/php/5.6/cli/conf.d/15-xml.ini,
/etc/php/5.6/cli/conf.d/20-calendar.ini,
/etc/php/5.6/cli/conf.d/20-ctype.ini,
/etc/php/5.6/cli/conf.d/20-curl.ini,
/etc/php/5.6/cli/conf.d/20-dom.ini,
/etc/php/5.6/cli/conf.d/20-exif.ini,
/etc/php/5.6/cli/conf.d/20-fileinfo.ini,
/etc/php/5.6/cli/conf.d/20-ftp.ini,
/etc/php/5.6/cli/conf.d/20-gettext.ini,
/etc/php/5.6/cli/conf.d/20-iconv.ini,
/etc/php/5.6/cli/conf.d/20-json.ini,
/etc/php/5.6/cli/conf.d/20-mbstring.ini,
/etc/php/5.6/cli/conf.d/20-mysql.ini,
/etc/php/5.6/cli/conf.d/20-mysqli.ini,
/etc/php/5.6/cli/conf.d/20-pdo_mysql.ini,
/etc/php/5.6/cli/conf.d/20-phar.ini,
/etc/php/5.6/cli/conf.d/20-posix.ini,
/etc/php/5.6/cli/conf.d/20-readline.ini,
/etc/php/5.6/cli/conf.d/20-shmop.ini,
/etc/php/5.6/cli/conf.d/20-simplexml.ini,
/etc/php/5.6/cli/conf.d/20-sockets.ini,
/etc/php/5.6/cli/conf.d/20-sysvmsg.ini,
/etc/php/5.6/cli/conf.d/20-sysvsem.ini,
/etc/php/5.6/cli/conf.d/20-sysvshm.ini,
/etc/php/5.6/cli/conf.d/20-tokenizer.ini,
/etc/php/5.6/cli/conf.d/20-wddx.ini,
/etc/php/5.6/cli/conf.d/20-xmlreader.ini,
/etc/php/5.6/cli/conf.d/20-xmlwriter.ini,
/etc/php/5.6/cli/conf.d/20-xsl.ini
user_ini.cache_ttl => 300 => 300
user_ini.filename => .user.ini => .user.ini
init_command_executed_count => 0
init_command_failed_count => 0
com_init_db => 0
Classes => AppendIterator, ArrayIterator, ArrayObject, BadFunctionCallException, BadMethodCallException, CachingIterator, CallbackFilterIterator, DirectoryIterator, DomainException, EmptyIterator, FilesystemIterator, FilterIterator, GlobIterator, InfiniteIterator, InvalidArgumentException, IteratorIterator, LengthException, LimitIterator, LogicException, MultipleIterator, NoRewindIterator, OutOfBoundsException, OutOfRangeException, OverflowException, ParentIterator, RangeException, RecursiveArrayIterator, RecursiveCachingIterator, RecursiveCallbackFilterIterator, RecursiveDirectoryIterator, RecursiveFilterIterator, RecursiveIteratorIterator, RecursiveRegexIterator, RecursiveTreeIterator, RegexIterator, RuntimeException, SplDoublyLinkedList, SplFileInfo, SplFileObject, SplFixedArray, SplHeap, SplMinHeap, SplMaxHeap, SplObjectStorage, SplPriorityQueue, SplQueue, SplStack, SplTempFileObject, UnderflowException, UnexpectedValueException

And this is the actual warning

PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php/20131226/curl.so' - /usr/lib/php/20131226/curl.so: undefined symbol: zend_unset_property in Unknown on line 0

Also checked that cURL isn't working. Any kind of help is highly appreciated.

Describe the bug
Since today i receive the following error:

==> Setup PHP
PHP Warning:  PHP Startup: Unable to load dynamic library 'xml.so' (tried: /usr/lib/php/20200930/xml.so (/usr/lib/php/20200930/xml.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/xml.so.so (/usr/lib/php/20200930/xml.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'curl.so' (tried: /usr/lib/php/20200930/curl.so (/usr/lib/php/20200930/curl.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/curl.so.so (/usr/lib/php/20200930/curl.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'enchant.so' (tried: /usr/lib/php/20200930/enchant.so (/usr/lib/php/20200930/enchant.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/enchant.so.so (/usr/lib/php/20200930/enchant.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'gd.so' (tried: /usr/lib/php/20200930/gd.so (/usr/lib/php/20200930/gd.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/gd.so.so (/usr/lib/php/20200930/gd.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'shmop.so' (tried: /usr/lib/php/20200930/shmop.so (/usr/lib/php/20200930/shmop.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/shmop.so.so (/usr/lib/php/20200930/shmop.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'sockets.so' (tried: /usr/lib/php/20200930/sockets.so (/usr/lib/php/20200930/sockets.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/sockets.so.so (/usr/lib/php/20200930/sockets.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'sysvmsg.so' (tried: /usr/lib/php/20200930/sysvmsg.so (/usr/lib/php/20200930/sysvmsg.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/sysvmsg.so.so (/usr/lib/php/20200930/sysvmsg.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'sysvsem.so' (tried: /usr/lib/php/20200930/sysvsem.so (/usr/lib/php/20200930/sysvsem.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/sysvsem.so.so (/usr/lib/php/20200930/sysvsem.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'sysvshm.so' (tried: /usr/lib/php/20200930/sysvshm.so (/usr/lib/php/20200930/sysvshm.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/sysvshm.so.so (/usr/lib/php/20200930/sysvshm.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'xml.so' (tried: /usr/lib/php/20200930/xml.so (/usr/lib/php/20200930/xml.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/xml.so.so (/usr/lib/php/20200930/xml.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'curl.so' (tried: /usr/lib/php/20200930/curl.so (/usr/lib/php/20200930/curl.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/curl.so.so (/usr/lib/php/20200930/curl.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'enchant.so' (tried: /usr/lib/php/20200930/enchant.so (/usr/lib/php/20200930/enchant.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/enchant.so.so (/usr/lib/php/20200930/enchant.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'gd.so' (tried: /usr/lib/php/20200930/gd.so (/usr/lib/php/20200930/gd.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/gd.so.so (/usr/lib/php/20200930/gd.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'shmop.so' (tried: /usr/lib/php/20200930/shmop.so (/usr/lib/php/20200930/shmop.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/shmop.so.so (/usr/lib/php/20200930/shmop.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'sockets.so' (tried: /usr/lib/php/20200930/sockets.so (/usr/lib/php/20200930/sockets.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/sockets.so.so (/usr/lib/php/20200930/sockets.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'sysvmsg.so' (tried: /usr/lib/php/20200930/sysvmsg.so (/usr/lib/php/20200930/sysvmsg.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/sysvmsg.so.so (/usr/lib/php/20200930/sysvmsg.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'sysvsem.so' (tried: /usr/lib/php/20200930/sysvsem.so (/usr/lib/php/20200930/sysvsem.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/sysvsem.so.so (/usr/lib/php/20200930/sysvsem.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'sysvshm.so' (tried: /usr/lib/php/20200930/sysvshm.so (/usr/lib/php/20200930/sysvshm.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/sysvshm.so.so (/usr/lib/php/20200930/sysvshm.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'xml.so' (tried: /usr/lib/php/20200930/xml.so (/usr/lib/php/20200930/xml.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/xml.so.so (/usr/lib/php/20200930/xml.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'curl.so' (tried: /usr/lib/php/20200930/curl.so (/usr/lib/php/20200930/curl.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/curl.so.so (/usr/lib/php/20200930/curl.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'enchant.so' (tried: /usr/lib/php/20200930/enchant.so (/usr/lib/php/20200930/enchant.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/enchant.so.so (/usr/lib/php/20200930/enchant.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'gd.so' (tried: /usr/lib/php/20200930/gd.so (/usr/lib/php/20200930/gd.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/gd.so.so (/usr/lib/php/20200930/gd.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'shmop.so' (tried: /usr/lib/php/20200930/shmop.so (/usr/lib/php/20200930/shmop.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/shmop.so.so (/usr/lib/php/20200930/shmop.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'sockets.so' (tried: /usr/lib/php/20200930/sockets.so (/usr/lib/php/20200930/sockets.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/sockets.so.so (/usr/lib/php/20200930/sockets.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'sysvmsg.so' (tried: /usr/lib/php/20200930/sysvmsg.so (/usr/lib/php/20200930/sysvmsg.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/sysvmsg.so.so (/usr/lib/php/20200930/sysvmsg.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'sysvsem.so' (tried: /usr/lib/php/20200930/sysvsem.so (/usr/lib/php/20200930/sysvsem.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/sysvsem.so.so (/usr/lib/php/20200930/sysvsem.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'sysvshm.so' (tried: /usr/lib/php/20200930/sysvshm.so (/usr/lib/php/20200930/sysvshm.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/sysvshm.so.so (/usr/lib/php/20200930/sysvshm.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'xml.so' (tried: /usr/lib/php/20200930/xml.so (/usr/lib/php/20200930/xml.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/xml.so.so (/usr/lib/php/20200930/xml.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'curl.so' (tried: /usr/lib/php/20200930/curl.so (/usr/lib/php/20200930/curl.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/curl.so.so (/usr/lib/php/20200930/curl.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'enchant.so' (tried: /usr/lib/php/20200930/enchant.so (/usr/lib/php/20200930/enchant.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/enchant.so.so (/usr/lib/php/20200930/enchant.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'gd.so' (tried: /usr/lib/php/20200930/gd.so (/usr/lib/php/20200930/gd.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/gd.so.so (/usr/lib/php/20200930/gd.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'shmop.so' (tried: /usr/lib/php/20200930/shmop.so (/usr/lib/php/20200930/shmop.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/shmop.so.so (/usr/lib/php/20200930/shmop.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'sockets.so' (tried: /usr/lib/php/20200930/sockets.so (/usr/lib/php/20200930/sockets.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/sockets.so.so (/usr/lib/php/20200930/sockets.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'sysvmsg.so' (tried: /usr/lib/php/20200930/sysvmsg.so (/usr/lib/php/20200930/sysvmsg.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/sysvmsg.so.so (/usr/lib/php/20200930/sysvmsg.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'sysvsem.so' (tried: /usr/lib/php/20200930/sysvsem.so (/usr/lib/php/20200930/sysvsem.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/sysvsem.so.so (/usr/lib/php/20200930/sysvsem.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'sysvshm.so' (tried: /usr/lib/php/20200930/sysvshm.so (/usr/lib/php/20200930/sysvshm.so: undefined symbol: zend_objects_not_comparable), /usr/lib/php/20200930/sysvshm.so.so (/usr/lib/php/20200930/sysvshm.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
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