How can I Seamlessly Switch PHP Versions on Mac OSX?

Seamless PHP Version Switching on Mac OSX

Developers working with PHP often face the need to test their applications across multiple PHP versions. This tutorial aims to guide Mac OSX users through an effortless method to install and switch between PHP versions using a simple script.

Step 1: Homebrew Installation

To proceed, ensure you have Homebrew installed on your Mac. Homebrew serves as a package manager and simplifies the installation and management of PHP versions.

Step 2: Install PHP Versions

Using Homebrew commands, install the desired PHP versions. For instance, to install PHP 5.3 up to PHP 8.2, run the following commands:

brew install php53
brew install php54
brew install php55
brew install php56
brew install php70
brew install php71
brew install php72
brew install php73
brew install php74
brew install php80
brew install php81
brew install php82

Step 3: Create a Script for Switching

To enable easy switching between versions, create a script and save it with an appropriate name, e.g., 'switch-php.sh'. The contents of this script would be:

#!/bin/bash

# Helper function to unlink an installed PHP version
unlink_php() {
  local php_version=""
  echo "Unlinking PHP $php_version..."
  brew unlink "php@$php_version"
}

# Helper function to link an installed PHP version
link_php() {
  local php_version=""
  echo "Linking PHP $php_version..."
  brew link "php@$php_version"
}

# Main function to switch PHP version
switch_php() {
  local desired_version=""
  if brew ls --versions "php@$desired_version" >/dev/null; then
    unlink_php current
    link_php "$desired_version"
    echo "PHP successfully switched to version $desired_version."
  else
    echo "PHP version $desired_version is not installed."
  fi
}

# Usage: switch-php <version>
# Example: switch-php 7.4

if [[ $# -ne 1 ]]; then
  echo "Usage: switch-php <version>"
  exit 1
fi

local current=$(php -v | grep 'PHP' | cut -d' ' -f2 | cut -d'.' -f1,2)
local chosen=""

switch_php "$chosen"

Step 4: Script Usage

To switch PHP versions, open Terminal and execute the following command (replace '' with the intended version):

bash switch-php.sh <version>

For example, to switch to PHP 7.4:

bash switch-php.sh 7.4

Additional Notes

• Make sure both versions of PHP you want to switch between have been installed.
• This script will only work for PHP versions that have been installed using Homebrew.
• If the chosen PHP version is not installed, the script will print an error message.

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