Is there support for PECL, if not, can it be installed?
I don’t think DH supports for PECL by default.
However, you can compile a customized PHP in DH. You can refer http://wiki.dreamhost.com/index.php/Installing_PHP5
If you have more questions about PHP, you can also refer http://wiki.dreamhost.com/index.php/Category:PHP
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Here is how PHP.net says to install the id3 is it possible?
id3 is part of PECL and can be installed using the PEAR installer. To compile PHP with id3 support, download the sourcecode, put it in php-src/ext/id3 and compile PHP using --enable-id3.