PHP preg_filter() substitute in PHP<5.3?

[Enannigeogeow]

Had to deploy some PHP code onto a shared server with only PHP5.2.8. All code works EXCEPT for the \[code\]preg_filter()\[/code\] call which was added in 5.3+ (and against which the code was written).Can anyone recommend an easy substitute for \[code\]preg_filter()\[/code\] in PHP5.2?