Intro
A list of micro-optimization tests / benchmarks. No guessing - just code and results. See testing page if you want to know the details of how each micro-optimization was tested. Add new code for the comparison - the tests will be run shortly.
Increment with foreach() and range() vs for()
f1 is slower than f2 by 0%
is_a / instanceof
f1 is slower than f2 by 0%
echooo
f1 is slower than f2 by 0%
strtr() vs str_replace()
f2 is slower than f1 by 9.76%
closure vs. create_function
f2 is slower than f1 by 104.93% (1 times slower)
preg_split vs explode
f1 is slower than f2 by 45.68%
array_merge vs foreach (with numeric keys)
f1 is slower than f2 by 85.06%
string concatenation (with double quotes) vs sprintf
f2 is slower than f1 by 138.68% (1.4 times slower)
string concatenation (with single quotes) vs sprintf
f2 is slower than f1 by 163.72% (1.6 times slower)
array_map with anonymous function vs convoluted example
f1 is slower than f2 by 65.55%
is_a vs instanceof
f1 is slower than f2 by 195.31% (2 times slower)
Use empty function or direct comparison (with undefined variable)
f2 is slower than f1 by 427.98% (4.3 times slower)
Use empty function or direct comparison (with defined variable)
f1 is slower than f2 by 0.84%
str_replace vs implode explode
f1 is slower than f2 by 135.91% (1.4 times slower)
str_replace vs preg_replace (without regular expression)
f2 is slower than f1 by 61.56%
file_exists vs is_file (existing files with error ignore)
f1 is slower than f2 by 232.94% (2.3 times slower)
file_exists vs is_file (non existing files)
f1 is slower than f2 by 53.52%
file_exists vs is_file (existing files)
f1 is slower than f2 by 371.63% (3.7 times slower)
Extended if vs short if
f2 is slower than f1 by 7.11%
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