php-ethereum-address 
$ composer require kornrunner/ethereum-address
Usage
Create a new address:
<?php
require_once 'vendor/autoload.php';
use kornrunner\Ethereum\Address;
$address = new Address();
// get address
$address->get();
// 4e1c45599f667b4dc3604d69e43722d4ace6b770
$address->getPrivateKey();
// 33eb576d927573cff6ae50a9e09fc60b672a8dafdfbe3045c7f62955fc55ccb4
$address->getPublicKey();
// 20876c03fff2b09ea01861f3b3789ada54a20a8c5e90170618364cbb02d8e6408401e120158f489376a1db3f8cde24f9432976d2f89aeb193fb5becc094a28b9Or load one from private key:
<?php
require_once 'vendor/autoload.php';
use kornrunner\Ethereum\Address;
$privateKey = '33eb576d927573cff6ae50a9e09fc60b672a8dafdfbe3045c7f62955fc55ccb4';
$address = new Address($privateKey);
// get address
$address->get();
// 4e1c45599f667b4dc3604d69e43722d4ace6b770
$address->getPrivateKey();
// 33eb576d927573cff6ae50a9e09fc60b672a8dafdfbe3045c7f62955fc55ccb4
$address->getPublicKey();
// 20876c03fff2b09ea01861f3b3789ada54a20a8c5e90170618364cbb02d8e6408401e120158f489376a1db3f8cde24f9432976d2f89aeb193fb5becc094a28b9License
MIT
0x9c7b7a00972121fb843af7af74526d7eb585b171