Improve http_build_query() performance #18401
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nielsdos
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Girgias
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Apr 23, 2025
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nielsdos
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This allows us to avoid a call to `zend_ini_str` which took 6% of the profile on my i7-4790 for a call to `http_build_query`. Now we can just grab the value from the globals. In other files this can avoid some length recomputations.
This avoids some assembly code bloat.
This avoids temporary allocations and some copies.
For this benchmark:
```php
for ($i=0;$i<2000000;$i++) {
http_build_query([999999 => 'foo', 'aaab' => 'def', 'aaaaa'=>1, 'aaaaaaaa' => 'a']);
}
```
On an i7-4790:
```
Benchmark 1: ./sapi/cli/php ../buildquery.php
Time (mean ± σ): 298.9 ms ± 7.3 ms [User: 295.6 ms, System: 2.3 ms]
Range (min … max): 293.6 ms … 314.0 ms 10 runs
Benchmark 2: ./sapi/cli/php_old ../buildquery.php
Time (mean ± σ): 594.8 ms ± 8.6 ms [User: 590.8 ms, System: 2.4 ms]
Range (min … max): 586.3 ms … 616.1 ms 10 runs
Summary
./sapi/cli/php ../buildquery.php ran
1.99 ± 0.06 times faster than ./sapi/cli/php_old ../buildquery.php
```
For this benchmark:
```php
for ($i=0;$i<2000000;$i++) {
http_build_query(['test' => 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa']);
}
```
On an i7-4790:
```
Benchmark 1: ./sapi/cli/php ../buildquery.php
Time (mean ± σ): 188.4 ms ± 6.7 ms [User: 184.6 ms, System: 2.9 ms]
Range (min … max): 182.0 ms … 205.4 ms 14 runs
Benchmark 2: ./sapi/cli/php_old ../buildquery.php
Time (mean ± σ): 323.9 ms ± 8.7 ms [User: 319.8 ms, System: 2.7 ms]
Range (min … max): 318.0 ms … 341.2 ms 10 runs
Summary
./sapi/cli/php ../buildquery.php ran
1.72 ± 0.08 times faster than ./sapi/cli/php_old ../buildquery.php
```
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