由於歷史專案用到了php5.6.31版本，而homebrew官方又在2018-01-19的時候宣佈移除Homebrew/php庫，導致不能通過homebrew安裝PHP歷史版本，通過google找到了這篇正確姿勢的文章，分享給大家。
在Mac電腦上Mojava版本想通過homebrew安裝php56發現安裝失敗。
$ brew info php@5.6.31
Error: No available formula with the name "php@5.6.31"
==> Searching for a previously deleted formula (in the last month)...
Error: No previously deleted formula found.
$ brew search php
==> Formulae
brew-php-switcher php@7.2
denji/nginx/php-session-nginx-module phplint
homebrew/nginx/php-session-nginx-module phpmd
php ✔ phpmyadmin
php-code-sniffer phpstan
php-cs-fixer phpunit
php@7.1
==> Casks
eclipse-php netbeans-php phpstorm在stackoverflow上找到一個好的方案：
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安裝exolnet/homebrew-deprecated
brew tap exolnet/homebrew-deprecated$ brew tap exolnet/homebrew-deprecated Updating Homebrew... ==> Auto-updated Homebrew! Updated 1 tap (homebrew/cask). No changes to formulae. ==> Tapping exolnet/deprecated Cloning into '/usr/local/Homebrew/Library/Taps/exolnet/homebrew-deprecated'... remote: Enumerating objects: 11, done. remote: Counting objects: 100% (11/11), done. remote: Compressing objects: 100% (11/11), done. remote: Total 11 (delta 1), reused 7 (delta 0), pack-reused 0 Unpacking objects: 100% (11/11), done. Tapped 2 formulae (42 files, 78.2KB). -
安裝php5.6
$ brew install php@5.6 -vvv ==> Installing php@5.6 from exolnet/deprecated ==> Downloading https://dl.bintray.com/exolnet/bottles-deprecated/php@5.6-5.6.40.mojave.bottle.2.tar.gz ==> Downloading from ... % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 17.6M 100 17.6M 0 0 167k 0 0:01:48 0:01:48 --:--:-- 126k ==> Verifying 01fecf5967040be0a73a38437b1e98b9b291b9e9ab2060eb248861e1553f26f4--php@5.6-5.6.40.mojave.bottle.2.tar.gz checksum ==> Pouring php@5.6-5.6.40.mojave.bottle.2.tar.gz ... ==> Summary ? /usr/local/Cellar/php@5.6/5.6.40: 498 files, 60.5MB至此安裝完成
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