PHP collections comparison

Memory performance

Items in collection: 0

type	var_class_sizeof(bytes)	var_sizeof(bytes)	memory_get_usage(bytes)
array(count: 0)	0	336	0
psalm(count: 0)	1,510	544	240
monomorphic(count: 0)	1,528	544	240
type-erased(count: 0)	1,512	544	240

Items in collection: 100

type	var_class_sizeof(bytes)	var_sizeof(bytes)	memory_get_usage(bytes)
array(count: 100)	0	7,728	12,248
psalm(count: 100)	1,510	7,936	12,432
monomorphic(count: 100)	1,528	7,936	12,432
type-erased(count: 100)	1,512	7,936	12,432

Items in collection: 1000

type	var_class_sizeof(bytes)	var_sizeof(bytes)	memory_get_usage(bytes)
array(count: 1000)	0	72,464	76,920
psalm(count: 1000)	1,510	72,672	77,104
monomorphic(count: 1000)	1,528	72,672	77,104
type-erased(count: 1000)	1,512	72,672	77,104

Items in collection: 10000

type	var_class_sizeof(bytes)	var_sizeof(bytes)	memory_get_usage(bytes)
array(count: 10000)	0	822,224	1,051,320
psalm(count: 10000)	1,510	822,432	1,051,560
monomorphic(count: 10000)	1,528	822,432	1,051,560
type-erased(count: 10000)	1,512	822,432	1,051,560

Speed performance

PHPBench (1.2.3) running benchmarks...
with configuration file: /app/phpbench.json
with PHP version 8.1.3, xdebug ❌, opcache ❌

\App\Tests\TypHintBench

    benchWithoutType........................R1 I6 - Mo240.713μs (±0.47%)
    benchWithArrayType......................R1 I70 - Mo247.663μs (±0.45%)
    benchWithMixedType......................R2 I59 - Mo249.293μs (±0.54%)
    benchWithClassType......................R1 I26 - Mo306.533μs (±0.48%)

Subjects: 4, Assertions: 0, Failures: 0, Errors: 0
+--------------+--------------------+-----+------+-----+-----------+-----------+--------+
| benchmark    | subject            | set | revs | its | mem_peak  | mode      | rstdev |
+--------------+--------------------+-----+------+-----+-----------+-----------+--------+
| TypHintBench | benchWithoutType   |     | 1000 | 100 | 674.272kb | 240.713μs | ±0.47% |
| TypHintBench | benchWithArrayType |     | 1000 | 100 | 674.272kb | 247.663μs | ±0.45% |
| TypHintBench | benchWithMixedType |     | 1000 | 100 | 674.272kb | 249.293μs | ±0.54% |
| TypHintBench | benchWithClassType |     | 1000 | 100 | 674.272kb | 306.533μs | ±0.48% |
+--------------+--------------------+-----+------+-----+-----------+-----------+--------+

How to reproduce

git clone git@github.com:mrsuh/php-collections-comparison.git && cd php-collections-comparison
docker build -t php-collections-comparison-image .
docker run -it --rm php-collections-comparison-image php bin/memory-test.php
docker run -it --rm php-collections-comparison-image php vendor/bin/phpbench run tests --report=aggregate