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| 1. sizeof vs count
First up are the sizeof and count functions. They can both be used to count the number of items in an array but does one do it better? sizeof vs count sizeof: 3.75928902626 seconds count: 3.33035206795 seconds Time saved: 0.428936958313 seconds; 12.8796280262% The evidence says yes. The count function was over 12% faster in this test. Both functions are fast though taking 3-4 microseconds to count an array with 100,000 items. You might think it isn't worth it but remember count is also a character shorter. Not only is it faster to run but it is also faster to type! 2. is_int vs is_integer Next it is time to try some validation with is_int and is_integer. is_int vs is_integer is_int: 3.11394786835 seconds is_integer: 3.42630600929 seconds Time saved: 0.312358140945 seconds; 9.11646946006% The difference is smaller this time but again both functions are executing in a little over 3 microseconds. is_int is faster than is_integer so again the shorter function name wins. Is this going to be a pattern? 3. chop vs rtrim Tidying up a string breaks the pattern. Maybe my analysis was a little premature. chop vs rtrim chop: 4.73731994629 seconds rtrim: 4.41647195816 seconds Time saved: 0.320847988129 seconds; 7.26480301852% rtrim is a little faster and these functions take longer at a little over 4 microseconds. 4. doubleval vs floatval Both these functions allow you to quickly pick a float, or double, out of a string. doubleval vs floatval doubleval: 4.56571412086 seconds floatval: 4.35375285149 seconds Time saved: 0.211961269379 seconds; 4.8684727087% 4% or 211 nanoseconds is next to nothing. I would want to use floatval but I wouldn't exactly be kicking myself if I slipped a doubleval into my code instead. 5. fwrite vs fputs So far all the functions have been running fast anyway so the difference haven't been that significant but things are starting to get interesting with the run time jumping to 20-24 microseconds to write a short string to a file. fwrite vs fputs fwrite: 24.9826359749 seconds fputs: 20.1990799904 seconds Time saved: 4.7835559845 seconds; 23.6820488199% With a difference of over 4 microseconds you could run both fputs and floatval in the time it takes to run fwrite. The difference is over 23% which clearly makes fputs the better function. It's shorter as well. 6. implode vs join This one really surprised me. I expected these functions to be faster. Both these functions allow you to convert an array into a string. implode is the opposite of explode and join allows you to join the items in an array with a 'glue' string. In this case the array had 100 items. implode vs join implode: 47.2712550163 seconds join: 50.1287050247 seconds Time saved: 2.85745000839 seconds; 5.70022705949% 5% doesn't seem like all that much but 2 microseconds shouldn't be ignored. 7. ini_alter vs ini_set Finally lets look at modifying the environment. I actually cheated here and just set the max execution time to 60 seconds a million times. I think the result is still valid though ini_alter vs ini_set ini_alter: 103.332370043 seconds ini_set: 86.2883789539 seconds Time saved: 17.0439910889 seconds; 19.7523598143% As might be expected these functions are expensive when it comes to execution time. That 17 microsecond saving is massive as well making ini_set the superior choice. |
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