使用Homebrew安装PHP 7.3
实用brew的好处就是PHP版本可以不被系统升级而改变，从而保证升级系统不会影响PHP环境
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| brew install php@7.3
brew link php@7.3
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安装Composer
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| wget https://getcomposer.org/installer
php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
php -r "if (hash_file('sha384', 'composer-setup.php') === 'baf1608c33254d00611ac1705c1d9958c817a1a33bce370c0595974b342601bd80b92a3f46067da89e3b06bff421f182') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
php composer-setup.php
php -r "unlink('composer-setup.php');"
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添加到全局
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| mv composer.phar /usr/local/bin/composer
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