ForBench.php

<?php

/**
 * @Iterations(10)
 * @Revs(100)
 * @BeforeMethods({"setUp"})
 * @ParamProviders({"provideNumber"})
 */
class ForBench
{
    private $values;

    public function setUp($params)
    {
        $this->values = array_fill(0, $params['number'], 'Hello');
    }

    public function benchOuterAssignmentCriteria()
    {
        $count = count($this->values);
        for ($i = 0; $i <= $count; $i++) {
        }
    }

    public function benchInlineAssignmentCriteria()
    {
        for ($i = 0; $i <= count($this->values); $i++) {
        }
    }

    public function benchInlineAssignmentStarting()
    {
        for ($i = count($this->values); $i >= 0; $i--) {
        }
    }

    public function provideNumber()
    {
        return array(
            array(
                'number' => 100,
            ),
            array(
                'number' => 1000,
            ),
            array(
                'number' => 10000,
            ),
        );
    }
}

results.md

PHPBench Benchmark Results

benchmark	subject	group	params	revs	its	mem	best	mean	mode	worst	stdev	rstdev	diff
ForBench	benchOuterAssignmentCriteria		{"number":"100"}	100	10	283,240b	0.013ms	0.014ms	0.014ms	0.014ms	0.277μs	2.02%	+3.15%
ForBench	benchOuterAssignmentCriteria		{"number":"1000"}	100	10	369,624b	0.116ms	0.119ms	0.121ms	0.122ms	2.352μs	1.97%	+797.40%
ForBench	benchOuterAssignmentCriteria		{"number":"10000"}	100	10	1,284,504b	1.139ms	1.169ms	1.161ms	1.205ms	19.049μs	1.63%	+8,687.27%
ForBench	benchInlineAssignmentCriteria		{"number":"100"}	100	10	283,192b	0.062ms	0.064ms	0.065ms	0.066ms	1.417μs	2.21%	+381.14%
ForBench	benchInlineAssignmentCriteria		{"number":"1000"}	100	10	369,576b	0.586ms	0.607ms	0.600ms	0.628ms	15.086μs	2.49%	+4,462.30%
ForBench	benchInlineAssignmentCriteria		{"number":"10000"}	100	10	1,284,456b	5.603ms	5.735ms	5.683ms	5.881ms	88.786μs	1.55%	+43,022.01%
ForBench	benchInlineAssignmentStarting		{"number":"100"}	100	10	283,192b	0.013ms	0.013ms	0.013ms	0.014ms	0.321μs	2.41%	0.00%
ForBench	benchInlineAssignmentStarting		{"number":"1000"}	100	10	369,576b	0.120ms	0.122ms	0.121ms	0.125ms	1.648μs	1.36%	+814.60%
ForBench	benchInlineAssignmentStarting		{"number":"10000"}	100	10	1,284,456b	1.298ms	1.336ms	1.334ms	1.400ms	26.941μs	2.02%	+9,945.27%