Mac无法卸载PHP 7.2求助：本地仍检测到该版本

Hey there, let's work through this PHP problem—Macs love hiding PHP instances in unexpected places, which is why you're seeing that weird mismatch between php -v and Magento's detection. Here's a step-by-step breakdown to get this sorted:

Step 1: Locate All Hidden PHP Executables #

First, we need to find every copy of PHP on your system, because Magento might be picking up one that's not in your terminal's PATH. Run these commands in your terminal:

• Find all PHP files (ignoring permission errors):

  find / -name php -type f 2>/dev/null
  

  Look for paths like /usr/bin/php (system default), /usr/local/bin/php (Homebrew), or even custom install locations like /opt/homebrew/bin/php (for Apple Silicon Macs).
• Check your current PATH to see which directories terminal uses to find PHP:

  echo $PATH
  

Step 2: Clean Up Homebrew PHP Residues #

If you installed PHP via Homebrew, make sure you've fully removed the old version:

• List any remaining PHP packages:

  brew list | grep php
  

• Force-uninstall PHP 7.2 (and any related packages):

  brew uninstall --force php@7.2
  

• Clean up Homebrew's cache and leftover files:

  brew cleanup
  

Step 3: Handle System-Supplied PHP #

MacOS includes a default PHP version that's often tucked away in /usr/bin/php. Warning: Deleting system PHP can break some built-in tools, so try these safer options first:

• Hide it from your terminal and Magento by modifying your shell config:
  Open ~/.zshrc (for Zsh) or ~/.bash_profile (for Bash) in a text editor, and add this line to prioritize other directories over the system PHP path:

  export PATH="/usr/local/bin:/opt/homebrew/bin:$PATH"
  

  Save the file and reload it with source ~/.zshrc or source ~/.bash_profile.
• If you absolutely need to disable the system PHP (use with caution), rename it instead of deleting:

  sudo mv /usr/bin/php /usr/bin/php.old
  

Step 4: Fix Magento's PHP Detection #

Magento doesn't always rely on your terminal's PATH—it might have scanned your system for PHP during initial setup. Here's how to fix that:

• Check if Magento is using a hardcoded PHP path: Look in app/etc/env.php for a php_binary entry. If it exists, update it to your desired PHP version's path (e.g., /usr/local/opt/php@7.0/bin/php if you install 7.0).
• When running Magento commands, explicitly call your target PHP version:

  /path/to/your/php7.0 bin/magento setup:install [your-install-flags]
  

Step 5: Install PHP 7.0 (If You Want to Downgrade) #

If you'd rather downgrade to PHP 7.0 instead of fully removing PHP, use Homebrew:

• Update Homebrew first:

  brew update
  

• Install PHP 7.0:

  brew install php@7.0
  

• Add it to your shell PATH (edit ~/.zshrc or ~/.bash_profile):

  export PATH="/usr/local/opt/php@7.0/bin:$PATH"
  export PATH="/usr/local/opt/php@7.0/sbin:$PATH"
  

• Reload your shell config and verify the version:

  source ~/.zshrc
  php -v
  

Step 6: Verify the Fix #

After following these steps, double-check:

• Run which php in terminal—it should either point to your new PHP 7.0 or return "php not found" if you fully uninstalled.
• Run the find command again to make sure no stray PHP executables are left:

  find / -name php -type f 2>/dev/null
  

Just a heads-up: Be careful with sudo commands—always double-check the paths you're modifying to avoid breaking your system.

内容的提问来源于stack exchange，提问作者Stefan Muntean