i built php class for parsing html templates , and i used preg_replace_callback function for parsing template while loops & if conditions , for loop , ... etc
i repeated the function many times , for every process , such as one time for parsing while loop , and another time for if conditions parsing .. etc , and repeated all of these steps again when parsing include files inside the template ,
but i think that this method of parsing is slow when parsing big template ,
so i think that using one while loop and read template line by line and compare it then parsing found line will be more fast ,
so what is your opinion , using one while loop and read the template file line by line and parsing it is more useful ? or using preg_replace_callback ?
and is it preferred to parse the codes inside the template ? by replacing it with php code then evaluate the template using eval() ? or parsing it inside the php file then append the result to the template ?
You seemed to already know the answer! Using a while loop will be much quicker. If you are concerned with speed of operations maybe grab a php profiler and run your own tests on speed.
Better still is to just accept that PHP is a template engine and not try to build a template engine in it. As I've said before it's like buying a truck to tow around a truck - inefficient at best.