Issue 678 — sysinfo.php: fatal 'Cannot redeclare checkPhpExtensions()' on every request — screen 500s (collides case-insensitively with configCheck.php)

Issue: #678 Branch: fix/issue-678 Status: FIXED & VERIFIED (2026-08-25)

Symptom

install/util/sysinfo.php returns HTTP 500 Internal Server Error on every request with an empty body. PHP error log shows:

PHP Fatal error: Cannot redeclare checkPhpExtensions() (previously declared in .../install/util/sysinfo.php:48) in .../lib/functions/configCheck.php on line 608

The diagnostic/info screen is completely inaccessible.

Root cause chain

1. install/util/sysinfo.php:26 does require_once config.inc.php.
2. config.inc.php does require_once configCheck.php.
3. lib/functions/configCheck.php:608 declares checkPhpExtensions() and :858 declares checkPhpVersion().
4. Back in sysinfo.php, line 32 declares checkPHPVersion() and line 48 declares checkPHPExtensions().
5. PHP function names are case-insensitive — both pairs collide → Fatal error: Cannot redeclare.

Regression source: configCheck.php was introduced in commit 464cfc12b; sysinfo.php was written independently before that, each defining their own diagnostic helper functions with colliding names.

Blast radius

• Only install/util/sysinfo.php is affected — no other file calls its local versions.
• configCheck.php functions are part of the global include chain and must NOT be renamed.

Fix

Renamed the two functions in sysinfo.php to unique names:

• checkPHPVersion() → sysinfo_checkPHPVersion() (definition line 32, call site line 263)
• checkPHPExtensions() → sysinfo_checkPHPExtensions() (definition line 48, call site line 264)

Files changed: install/util/sysinfo.php (4 lines)

Verification

• php -l install/util/sysinfo.php → No syntax errors
• curl -s -o /dev/null -w "%{http_code}" http://localhost:8082/install/util/sysinfo.php → 200 (was 500)
• All 7 diagnostic sections render correctly (PHP Information, PHP Extensions, Memory & Execution Limits, Database Connection, Server Environment, File Permissions, footer)
• No new Error/Warning entries in Event Viewer
• Browser screenshot confirms full page rendering