We can disable magic quotes in joomla by editing the php.ini file.
Your default php.ini file exists for each cPanel account in public_html folder. To edit the magic_quotes settings, you will first need to open your cPanel, navigate to the public_html folder using the File Manager, and then edit the php.ini file.
You can disable magic quotes in joomla by adding the following line to the php.ini file.
magic_quotes_gpc = Off
If it does not solve the issue you need to add the following lines to the php.ini .
magic_quotes_gpc = Off magic_quotes_runtime = Off magic_quotes_sybase = Off extension=pdo.so extension=pdo_mysql.so
Save the file. This will disable the magic_quotes for that domain.