Composer is a tool for dependency management in PHP. It allows you to declare the libraries your project depends on and it will manage (install/update) them for you.
下载安装器
php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
校验
php -r "if (hash_file('sha384', 'composer-setup.php') === '906a84df04cea2aa72f40b5f787e49f22d4c2f19492ac310e8cba5b96ac8b64115ac402c8cd292b8a03482574915d1a8') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
本地工程安装
php composer-setup.php --install-dir=bin --filename=composer All settings correct for using Composer Downloading... Composer (version 2.2.3) successfully installed to: ../bin/composer Use it: php bin/composer localhost:vms chong$ php bin/composer --version Composer version 2.2.3 2021-12-31 12:18:53
全局安装
php composer-setup.php
sudo mv composer.phar /usr/local/bin/composer
常见异常处理
1、preg_replace(): Allocation of JIT memory failed
php bin/composer update
[ErrorException] preg_replace(): Allocation of JIT memory failed, PCRE JIT will be disabled. This is likely caused by security restrictions. Either grant PHP permission to allocate executable memory, or set pcre.jit=0 install [--prefer-source] [--prefer-dist] [--prefer-install PREFER-INSTALL] [--dry-run] [--dev] [--no-suggest]
[--no-dev] [--no-autoloader] [--no-progress] [--no-install] [-v|vv|vvv|--verbose] [-o|--optimize-autoloader]
[-a|--classmap-authoritative] [--apcu-autoloader] [--apcu-autoloader-prefix APCU-AUTOLOADER-PREFIX]
[--ignore-platform-req IGNORE-PLATFORM-REQ] [--ignore-platform-reqs] [--] [<packages>]...
解决办法
/Applications/XAMPP/xamppfiles/etc/php.ini
修改php.ini：
将
;pcre.jit=1
改为：
pcre.jit=0
保存，重启php服务即可