php-redisHow to delete keys matching pattern

Usage example

<?php

$r = new Redis(); 
$r->connect('127.0.0.1', 6379);

$r->set('prefa', 1);
$r->set('prefb', 1);
print_r($r->keys('pref*'));

$r->delete($r->keys('pref*'));
print_r($r->keys('pref*'));

output

Array
(
    [0] => prefb
    [1] => prefa
)
Array
(
)