Summary of Changes

Changed the exit code from 0 (success) to 1 (error) when attempting to install Joomla from CLI without the minimum required PHP version. Currently, the installation script exits with code 0 even when the PHP version check fails, which incorrectly signals success to shell scripts and CI/CD pipelines.

Testing Instructions

Prerequisites:

• Access to a system with PHP 8.0.x or lower (8.2.x also works for testing in Joomla 6.x)

Steps to test:

1. Verify your PHP CLI version:

   php -v

2. Navigate to the Joomla installation directory

3. Run the CLI installation command:

   php installation/joomla.php

4. Check the exit code immediately after:

   • Linux/macOS: echo $?
   • Windows (PowerShell): echo $LASTEXITCODE

Actual result BEFORE applying this Pull Request

When running the CLI installation with PHP < 8.1.0:

• Error message is displayed correctly
• Exit code is 0 (success)
• Shell scripts and CI/CD pipelines incorrectly interpret this as successful execution
• Automation workflows may continue with subsequent steps despite the failure

$ php installation/joomla.php
Sorry, your PHP version is not supported.
Your command line php needs to be version 8.1.0 or newer to run the Joomla! CLI Tools
The version of PHP currently running this code, at the command line, is PHP version 7.x.x.
...

$ echo $?
0  ← WRONG: indicates success

Expected result AFTER applying this Pull Request

When running the CLI installation with PHP < 8.3.0:

• Error message is displayed correctly (unchanged)
• Exit code is 1 (error)
• Shell scripts and CI/CD pipelines correctly identify the failure
• Automation workflows can properly handle the error condition

$ php installation/joomla.php
Sorry, your PHP version is not supported.
Your command line php needs to be version 8.1.0 or newer to run the Joomla! CLI Tools
The version of PHP currently running this code, at the command line, is PHP version 7.x.x.
...

$ echo $?
1  ← CORRECT: indicates error

Link to documentations

Please select:

• No documentation changes for docs.joomla.org needed
• No documentation changes for manual.joomla.org needed

Rationale: This is a bug fix that corrects the exit code behavior to match standard Unix/POSIX conventions. No user-facing functionality or documentation is affected.