Parallel function call in php

Question

Is there a way to execute internal functions in parallel in PHP?

For example, I have four functions:

function a(){
    return 1;
}

function b(){
    return 2;
}

function c(){
    return 3;
}

function d(){
    return 4;
}

When I call these functions sequentially like this:

function E(){
    $response = [] ;
    $response['a'] = a();
    $response['b'] = b();
    $response['c'] = c();
    $response['d'] = d();
}

They execute in sequential order. However, I want to call them in parallel. Is there any way to achieve this in PHP?

I tried with AMP and swoole php but not worked

Answer 1

Swoole can do this. Does not work is not a proper description.

Mutliple corotuines created with go are executed concurrently.

<?php
co::run(function() {
    go(function () {
        co::sleep(3);
        go(function () {
            co::sleep(2);
            echo "co[3] end\n";
        });
        echo "co[2] end\n";
    });

    co::sleep(1);
    echo "co[1] end\n";
});

<?php

use Swoole\Coroutine;

function a()
{
    echo 1;
    sleep(1);
    echo __FUNCTION__;
}

function b()
{
    echo 2;
    sleep(1);
    echo __FUNCTION__;
}

function c()
{
    echo 3;
    sleep(1);
    echo __FUNCTION__;
}

function d()
{
    echo 4;
    sleep(1);
    echo __FUNCTION__;
}

Coroutine\run(function () {
    Coroutine::create('a');
    Coroutine::create('b');
    Coroutine::create('c');
    Coroutine::create('d');
});

learn more https://openswoole.com/docs/modules/swoole-coroutine-create