Online PHP editor | rfc for T23MH

@ 2025-07-07T05:40:32Z

<?php

// Proposal idea of enabling the unrolling in the userland.

function measure(string $label, callable $fn): void {
    $start = hrtime(true);
    $result = $fn();
    $end = hrtime(true);
    $elapsed = ($end - $start) / 1e9;
    echo "Sum: {$result}, {$label}: " . number_format($elapsed, 6) . " seconds\n";
}

$array = range(1, 1e6);

$n = count($array);

measure("Normal for loop", function () use ($array, $n) {
    $sum = 0;
    for ($i = 0; $i < $n; $i++) {
        $sum += $array[$i];
    }
    return $sum;
}); // Sum: 500000500000, Normal for loop: 0.047172 seconds

measure("Manual Unrolled x4", function () use ($array, $n) {
    $sum = 0;
    for ($i = 0; $i < $n; $i += 4) {
        $sum += $array[$i] + $array[$i + 1] + $array[$i + 2] + $array[$i + 3];
    }
    return $sum;
}); // Sum: 500000500000, Manual Unrolled x4: 0.042200 seconds

measure("Manual Unrolled x8", function () use ($array, $n) {
    $sum = 0;
    for ($i = 0; $i < $n; $i += 8) {
        $sum += $array[$i] + $array[$i + 1] + $array[$i + 2] + $array[$i + 3]
              + $array[$i + 4] + $array[$i + 5] + $array[$i + 6] + $array[$i + 7];
    }
    return $sum;
}); // Sum: 500000500000, Manual Unrolled x8: 0.036472 seconds

// Attributed Unroll - this is handled by your modified compiler
measure("Attributed Unrolled #[Unroll(4)]", function () use ($array, $n) {
    $sum = 0;
    // @TODO: KhaledAlam: Unrolling logic of zend_compile_for( )
    // #[Unroll(4)]
    for ($i = 0; $i < $n; $i++) {
        $sum += $array[$i];
    }
    return $sum;
}); // Sum: 0, Attributed Unrolled #[Unroll(4)]: 0.000002 seconds

Output for git.master_jit: Sum: 500000500000, Normal for loop: 0.008335 seconds Sum: 500000500000, Manual Unrolled x4: 0.005305 seconds Sum: 500000500000, Manual Unrolled x8: 0.004796 seconds Sum: 500000500000, Attributed Unrolled #[Unroll(4)]: 0.006195 seconds
Output for git.master: Sum: 500000500000, Normal for loop: 0.006009 seconds Sum: 500000500000, Manual Unrolled x4: 0.005082 seconds Sum: 500000500000, Manual Unrolled x8: 0.004807 seconds Sum: 500000500000, Attributed Unrolled #[Unroll(4)]: 0.006100 seconds

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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