pecl/parallel

A succinct parallel concurrency API for PHP 8

v1.2.12 2026-03-18 13:39 UTC

Requires

• php: >= 8.0.0

PHP-3.01

Extension name: ext-parallel

Supports Zend Thread Safety (ZTS): ✅

Supports non-Thread Safe mode (NTS): ❌

Supported operating systems: no restrictions

Configure flags:

• --enable-parallel Enable parallel support
• --enable-parallel-dev Enable parallel developer flags
• --enable-parallel-address-sanitizer Enable address sanitizer flags for parallel
• --enable-parallel-gcov Enable gcov for parallel

README

A succinct parallel concurrency API for PHP 8

Documentation

Documentation can be found in the PHP manual: https://php.net/parallel

Requirements and Installation

See INSTALL.md

Hello World

<?php
$runtime = new \parallel\Runtime();

$future = $runtime->run(function(){
    for ($i = 0; $i < 500; $i++)
        echo "*";

    return "easy";
});

for ($i = 0; $i < 500; $i++) {
    echo ".";
}

printf("\nUsing \\parallel\\Runtime is %s\n", $future->value());

This may output something like (output abbreviated):

.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*
Using \parallel\Runtime is easy

Development

See CONTRIBUTING.md for guidelines on contribution and development (and debugging).