The symfony advent calendar is still up and running, an today it reaches the 21st tutorial for the askeet application.
We promised you we would add to askeet the feature that the symfony community would ask the most. We secretly dreamt of some easy-to-add feature, but the community really insisted on having a search engine. So we developed an easy-to-add search engine.
It's all in PHP, database independant, with ordering of the results according to the relevancy, weighting of the indexed words, etc. As a bonus, it can probably be transposed as it is to your personal symfony application.
As usual, it takes less than one hour to implement, and less than fifteen minutes to read. Enjoy!