Unable to find pcntl on homebrew in mac high sierra

Question

I have been trying to install pcntl extension using homebrew in MacOS High sierra using command

brew install homebrew/php/php71-pcntl
brew install homebrew-php/php71-pcntl

Also tried with php54, 55, 56, 70 I m getting error

Updating Homebrew...

Error: No available formula with the name "homebrew/php/php7-pcntl" 
==> Searching for a previously deleted formula (in the last month)...
Warning: homebrew/php is shallow clone. To get complete history run:
  git -C "$(brew --repo homebrew/php)" fetch --unshallow

Error: No previously deleted formula found.
==> Searching for similarly named formulae...
==> Searching local taps...
Error: No similarly named formulae found.

Why its not finding the formulae on my Mac I have php 7.1.14 on my mac

Answer 1

Once successfully installing php@7.2 from brew. Stop php7.1 and Start php7.2

brew services stop php@7.1
brew unlink php71

And

brew services start php@7.2
brew link php72

If it fails run the following

  echo 'export PATH="/usr/local/opt/php@7.2/bin:$PATH"' >> ~/.zshrc
  echo 'export PATH="/usr/local/opt/php@7.2/sbin:$PATH"' >> ~/.zshrc

Answer 2

In February and March 2018 the PHP formulas for the currently supported PHP versions (5.6, 7.0, 7.1, 7.2 at the moment of this writing) were moved to the core Homebrew tap and in April 2018 the PHP tap has been archived.

To install the current PHP version (7.2) use:

$ brew install php

To install one of the other supported versions use:

$ brew install php@5.6

(replace 5.6 with 7.0 or 7.1 for the other versions).

All the formulas installed this way contain the pcntl extension, there is no need for anything else.