Mac+；作曲家+；PHP版本迷失

我有一个安装了PHP的MacBookPro。我想安装composer软件包。通过运行

composer install

我得到了消息

  Problem 1
    - Installation request for ocramius/proxy-manager 2.2.2 -> satisfiable by ocramius/proxy-manager[2.2.2].
    - ocramius/proxy-manager 2.2.2 requires php ^7.2.0 -> your PHP version (7.1.23) does not satisfy that requirement.
  Problem 2
    - ocramius/proxy-manager 2.2.2 requires php ^7.2.0 -> your PHP version (7.1.23) does not satisfy that requirement.
    - doctrine/migrations v1.5.0 requires ocramius/proxy-manager ^1.0|^2.0 -> satisfiable by ocramius/proxy-manager[2.2.2].
    - Installation request for doctrine/migrations v1.5.0 -> satisfiable by doctrine/migrations[v1.5.0].

但是当我运行

php-v

时，我得到

PHP 7.2.9 (cli) (built: Aug 23 2018 02:08:27) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies
    with Xdebug v2.6.1, Copyright (c) 2002-2018, by Derick Rethans
    with Zend OPcache v7.2.9, Copyright (c) 1999-2018, by Zend Technologie

这是怎么可能的？我该如何修复它？

您可能会发现这一点很有用：

head-1$（哪个作曲家）

告诉您什么？您可能会发现这一点很有用：

head-1$（哪个作曲家）

告诉您什么？