Instead of using a boolean flag to check for each element whether or not it is
the first, we just unconditionally append a comma after each element and then
remove the last comma at the end.
For:
<?php
$len = 0;
for ($i = 0; $i < 3_000_000; $i++) {
$len += strlen(json_encode(array_fill(0, 20, [])));
}
var_dump($len);
This is ~1.06 faster for a gcc 13.3 release build on a Intel(R) Core(TM)
i7-1365U.
Benchmark 1: /tmp/bench/before /tmp/bench/test6.php
Time (mean ± σ): 819.6 ms ± 2.8 ms [User: 816.4 ms, System: 2.4 ms]
Range (min … max): 816.9 ms … 825.0 ms 10 runs
Benchmark 2: /tmp/bench/after /tmp/bench/test6.php
Time (mean ± σ): 770.8 ms ± 5.8 ms [User: 766.6 ms, System: 2.9 ms]
Range (min … max): 765.3 ms … 785.8 ms 10 runs
Summary
/tmp/bench/after /tmp/bench/test6.php ran
1.06 ± 0.01 times faster than /tmp/bench/before /tmp/bench/test6.php
Tim Düsterhus
18d99ee4b7