[[!meta title="How do I enable additional PHP extensions?"]]
Several PHP extensions are installed on the scripts servers, but
not enabled by default. (Since most scripts do not use these
extensions, this saves startup time and memory.) You can load any
of these extensions by creating a text file called `php.ini` in the
same directory as your PHP script, and adding a line with:

> **extension =**[extension name]**.so**

one line for each extension you want to enable.

Note that this will override some settings in the global php.ini —
most importantly, this will cause magic\_quotes\_gpc to turn
**on**! You should make sure that your application unsets this
option, or set **magic\_quotes\_gpc = no** in your own php.ini
file.

The following are the extensions installed on the scripts servers,
with links to more information about them from the PHP website.

-   [bcmath](http://php.net/bc)
-   [curl](http://php.net/curl)
-   [dba](http://php.net/dba)
-   [dom](http://php.net/dom)
-   [fileinfo](http://php.net/fileinfo)
-   [gd](http://php.net/gd)
-   [imap](http://php.net/imap)
-   [imagick](http://php.net/imagick)
-   [json](http://php.net/json)
-   [ldap](http://php.net/ldap)
-   [mailparse](http://php.net/mailparse)
-   [mbstring](http://php.net/mbstring)
-   [mcrypt](http://php.net/mcrypt)
-   [mysql](http://php.net/mysql)
-   [mysqli](http://php.net/mysqli)
-   [ncurses](http://php.net/ncurses)
-   [odbc](http://php.net/odbc)
-   [pdo](http://php.net/pdo)
-   [pdo\_mysql](http://php.net/pdo_mysql) (requires pdo)
-   [pdo\_odbc](http://php.net/pdo_odbc) (requires pdo)
-   [pdo\_pgsql](http://php.net/pdo_pgsql) (requires pdo)
-   [pdo\_sqlite](http://php.net/pdo_sqlite) (requires pdo)
-   [pgsql](http://php.net/pgsql)
-   [rrdtool](http://oss.oetiker.ch/rrdtool/)
-   [snmp](http://php.net/snmp)
-   [soap](http://php.net/soap)
-   [tidy](http://php.net/book.tidy)
-   [xmlreader](http://php.net/xmlreader)
-   [xmlrpc](http://php.net/xmlrpc)
-   [xmlwriter](http://php.net/xmlwriter)
-   [xsl](http://php.net/xsl)
-   [zip](http://php.net/zip)