コマンド
$ phpbrew install 7.1.23 +default+dbs
$ phpbrew use 7.1.23 #一時的に使う
$ phpbrew switch 7.1.23 #ずっと使う
参考
Laravel 5.2 Requirements
PHP version between 5.5.9 - 7.1.*
OpenSSL PHP Extension
PDO PHP Extension
Mbstring PHP Extension
Tokenizer PHP Extension
phpbrew variants
default: bcmath, bz2, calendar, cli, ctype, dom, fileinfo, filter, ipc,
json, mbregex, mbstring, mhash, mcrypt, pcntl, pcre, pdo, phar,
posix, readline, sockets, tokenizer, xml, curl, openssl, zip
dbs: sqlite, mysql, pgsql, pdo