unscientific test of different foreach syntax

output.txt

$ php test.php
Running 10 tests of 5000 iterations
finished 1 of 10
finished 2 of 10
finished 3 of 10
finished 4 of 10
finished 5 of 10
finished 6 of 10
finished 7 of 10
finished 8 of 10
finished 9 of 10
finished 10 of 10
Function test_inline:
	Mean time: 1.1466787576675
	Min: 1.0665309429169
	Max: 1.2747008800507
Function test_declared:
	Mean time: 1.1542639493942
	Min: 1.0916991233826
	Max: 1.2733070850372

test.php

<?php

function get_long_array() {
    $arr = [];
    for ($x = 0; $x < 1000; $x++) {
        $arr[] = $x;
    }
    return $arr;
}

function test_inline($iterations) {
    for ($x = 0; $x < $iterations; $x++) {
        $sum = 0;
        foreach (get_long_array() as $k => $v) {
            $sum += $v;
        }
    }
}

function test_declared($iterations) {
    for ($x = 0; $x < $iterations; $x++) {
        $sum = 0;
        $result = get_long_array();
        foreach ($result as $k => $v) {
            $sum += $v;
        }
    }
}

$results = [
    'test_inline' => [],
    'test_declared' => [],
];

$trials_per_func = 10;
$iterations_per_test = 5000;

echo "Running $trials_per_func tests of $iterations_per_test iterations\n";

for ($x = 0; $x < $trials_per_func; $x++) {
    foreach (array_keys($results) as $funcname) {
        $time_start = microtime(true);
        $funcname($iterations_per_test);
        $time_end = microtime(true);
        $exec_time = $time_end - $time_start;
        $results[$funcname][] = $exec_time;
    }
    echo "finished " . ($x + 1) . " of $trials_per_func\n";
}

foreach ($results as $funcname => $func_results) {
    $mean = array_sum($func_results) / floatval(count($func_results));
    $max = max($func_results);
    $min = min($func_results);
    echo "Function $funcname:\n";
    echo "\tMean time: $mean\n";
    echo "\tMin: $min\n";
    echo "\tMax: $max\n";
}