我已经安装了ondrej / php 5.6 7.0 7.1和7.2软件包。
已安装PHP 5.6，并启用了所有扩展，包括mcrypt。
$ alias php="/usr/bin/php5.6"
$ php -v
PHP 5.6.36-1+ubuntu16.04.1+deb.sury.org+1 (cli)
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies
with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend Technologies
$ php -i | grep mcrypt
/etc/php/5.6/cli/conf.d/20-mcrypt.ini,
Registered Stream Filters => zlib.*, string.rot13, string.toupper, string.tolower, string.strip_tags, convert.*, consumed, dechunk, bzip2.*, convert.iconv.*, mcrypt.*, mdecrypt.*
mcrypt
mcrypt support => enabled
mcrypt_filter support => enabled
mcrypt.algorithms_dir => no value => no value
mcrypt.modes_dir => no value => no value
$ composer show -i
You are using the deprecated option "installed". Only installed packages are shown by default now. The --all option can be used to show all packages.
aws/aws-sdk-php 2.8.31 AWS SDK for PHP - Use Amazon Web Services in your PHP project
barryvdh/laravel-debugbar v1.8.9 PHP Debugbar integration for Laravel
baum/baum 1.0.15 Baum is an implementation of the Nested Set pattern for Eloquent models.
brouwers/shortcodes 1.0.2 Wordpress like shortcodes for Laravel 4.2
cartalyst/sentry v2.1.7 PHP 5.3+ Fully-featured Authentication & Authorization System
classpreloader/classpreloader 1.0.2 Helps class loading performance by generating a single PHP file containing all of the autoloaded files for a specific use case
d11wtq/boris v1.0.10 A tiny, but robust REPL (Read-Evaluate-Print-Loop) for PHP.
damianromanowski/simplecdn dev-master 47611af Laravel 4 simple content delivery network URL rewriter
estina/smartfocus 1.3.0 SmartFocus API
filp/whoops 1.1.10 php error handling for cool kids
guzzle/guzzle v3.9.3 PHP HTTP client. This library is deprecated in favor of https://packagist.org/packages/guzzlehttp/guzzle
guzzlehttp/guzzle 6.3.3 Guzzle is a PHP HTTP client library
guzzlehttp/promises v1.3.1 Guzzle promises library
guzzlehttp/psr7 1.4.2 PSR-7 message implementation that also provides common utility methods
imagecow/imagecow v1.5.1 PHP library to manipulate and generate responsive images
ircmaxell/password-compat v1.0.4 A compatibility library for the proposed simplified password hashing algorithm: https://wiki.php.net/rfc/password_hash
jeremeamia/SuperClosure 1.0.2 Doing interesting things with closures like serialization.
kevbaldwyn/image dev-master 0cb45d5 A Laravel 4 package to aid generating automatically resized images on the fly and generating responsive images.
laravel/framework v4.2.22 The Laravel Framework.
maatwebsite/excel 1.3.10 An eloquent way of importing and exporting Excel and CSV in Laravel 4 with the power of PHPExcel
mailin-api/mailin-api-php dev-master b437808 Official SendinBlue provided API V2 wrapper
mandrill/mandrill 1.0.55 API client library for the Mandrill email as a service platform
maximebf/debugbar v1.10.5 Debug bar in the browser for php application
monolog/monolog 1.23.0 Sends your logs to files, sockets, inboxes, databases and various web services
nesbot/carbon 1.32.0 A simple API extension for DateTime.
nikic/php-parser v0.9.5 A PHP parser written in PHP
paragonie/random_compat v1.4.3 PHP 5.x polyfill for random_bytes() and random_int() from PHP 7
patchwork/utf8 v1.3.1 Portable and performant UTF-8, Unicode and Grapheme Clusters for PHP
phpoffice/phpexcel 1.8.1 PHPExcel - OpenXML - Read, Create and Write Spreadsheet documents in PHP - Spreadsheet engine
phpseclib/phpseclib 0.3.10 PHP Secure Communications Library - Pure-PHP implementations of RSA, AES, SSH2, SFTP, X.509 etc.
predis/predis v0.8.7 Flexible and feature-complete PHP client library for Redis
psr/http-message 1.0.1 Common interface for HTTP messages
psr/log 1.0.2 Common interface for logging libraries
roumen/feed v2.8.8 A simple feed generator for Laravel.
stack/builder v1.0.5 Builder for stack middlewares based on HttpKernelInterface.
swiftmailer/swiftmailer v5.4.9 Swiftmailer, free feature-rich PHP mailer
symfony/browser-kit v2.7.48 Symfony BrowserKit Component
symfony/console v2.7.48 Symfony Console Component
symfony/css-selector v2.7.48 Symfony CssSelector Component
symfony/debug v2.7.48 Symfony Debug Component
symfony/dom-crawler v2.7.48 Symfony DomCrawler Component
symfony/event-dispatcher v2.8.42 Symfony EventDispatcher Component
symfony/filesystem v2.8.42 Symfony Filesystem Component
symfony/finder v2.7.48 Symfony Finder Component
symfony/http-foundation v2.7.48 Symfony HttpFoundation Component
symfony/http-kernel v2.7.48 Symfony HttpKernel Component
symfony/polyfill-ctype v1.8.0 Symfony polyfill for ctype functions
symfony/polyfill-mbstring v1.8.0 Symfony polyfill for the Mbstring extension
symfony/process v2.7.48 Symfony Process Component
symfony/routing v2.7.48 Symfony Routing Component
symfony/security-core v2.7.48 Symfony Security Component - Core Library
symfony/translation v2.7.48 Symfony Translation Component
symfony/var-dumper v2.8.42 Symfony mechanism for exploring and dumping PHP variables
tijsverkoyen/css-to-inline-styles 1.5.5 CssToInlineStyles is a class that enables you to convert HTML-pages/files into HTML-pages/files with inline styles.
我需要使用composer install来设置PHP 5.6。
但是我得到了mcrypt扩展错误：
$ composer install
Loading composer repositories with package information
Installing dependencies (including require-dev) from lock file
Nothing to install or update
Generating autoload files
> php artisan clear-compiled
Mcrypt PHP extension required.
Script php artisan clear-compiled handling the post-install-cmd event returned with error code 1
我也尝试过：
$ /usr/bin/php5.6 /usr/local/bin/composer install
和
$ alias composer="/usr/bin/php5.6 /usr/local/bin/composer"
$ composer install
但是总是有相同的错误。
有什么要强迫作曲家使用PHP 5.6的想法吗？
谢谢！
答案 0 :(得分：0)
问题不在于作曲家，而在于php artisan clear-compiled composer.json事件中配置的php artisan optimize和post-install-cmd。
此命令使用本地php-cli版本执行。