Detailed graphic and text explanation of how to install mcrypt extension on ubuntu14php5.5

Install php5-mcrypt

sudo apt-get install php5-mcrypt

Edit phpConfiguration file

sudo gedit /etc/php5/apache2/php.ini

Add under extension (any independent line will do)

extension=php_mcrypt.so (原来的php5-mcrypt.so无效)

Save and restart apache2

sudo /etc/init.d/apache2 restart

If there is no mcrypt extension in your phpinfo after restarting:

Option 1:

cd /etc/php5/cli/conf.d

sudo ln -s ../../mods-available/mcrypt.ini 20-mcrypt.ini

Option 2:

cd /etc/php5/cli/conf.d

sudo ln -s ../../mods-available/mcrypt.ini 20-mcrypt.ini

php5enmod mcrypt

service apache2 restart

ps:对于Ubuntu，简单的安装php5-mcrypt并不能正常工作，你需要以root用户执行上面方案二的命令去启用它；

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