With PHP 5.3 the new era of PHP frameworks has begun, and things are really, for example, simpler to integrate, thanks to the PSR0, which is the standard autoloader adopted by the community.
The PSR0 is, obviously, not supported by the symfony 1.4 framework, which was released far before PHP 5.3 was ready, but it’s not that difficult to integrate PSR0-compliant projects in Sf1.4.
If you want, for example, to use the Zend Framework 2 in symfony you just need a few quick steps: first of all, copy the standard SplClassLoader in your symfony project ( lib/autoload? ), then require it in your projectConfiguration.class.php:
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