Created
March 26, 2024 13:51
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inline call for loop list vs variable assignment
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| <?php | |
| // THIS DOESN'T WORK! | |
| // SOME WEIRD INTERNAL CACHING IS HAPPENING - whichever is executed second | |
| // is faster! | |
| function getLoopList() { | |
| return range(1, 10); | |
| } | |
| function slowVersion() { | |
| // Slow version | |
| $t1 = microtime(true); | |
| $list = getLoopList(); | |
| foreach ($list as $item) { | |
| $item ** $item; | |
| } | |
| $t2 = microtime(true); | |
| echo "slow time: " . number_format($t2 - $t1, 20) . "\n"; | |
| return $t2 - $t1; | |
| } | |
| function optimisedVersion() { | |
| // Optimized version | |
| $t3 = microtime(true); | |
| foreach (getLoopList() as $item) { | |
| $item ** $item; | |
| } | |
| $t4 = microtime(true); | |
| echo "fast time: " . number_format($t4 - $t3, 20) . "\n"; | |
| return $t4 - $t3; | |
| } | |
| optimisedVersion(); | |
| slowVersion(); | |
| // $speedup = round(100 * (($t2 - $t1) - ($t4 - $t3)) / ($t2 - $t1), 0); | |
| // echo "speedup: {$speedup}%\n"; |
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