PHP8 support

[jlouism]

No description provided.

[KmeCnin]

Summary of changes

1) PHP 8 / 8.2 compatibility hardening

• Replaced deprecated sizeOf() calls with count() across multiple files (commit message mentions 32 occurrences across 10 files).
• Added explicit public visibility to methods that previously relied on implicit visibility (237 methods across 22 class files, per commit message).
• Fixed PHP 8+ incompatibility in implode() usage:
  changed from implode($array, ',') to implode(',', $array) in
  scheduledBackup::validateRotateMethod() (the old argument order breaks on PHP 8+).
• Fixed additional PHP 8.1 / 8.2 issues mentioned in commit notes:
  • missing spaces in public function declarations,
  • dbConnection::query() signature aligned with its mysqli parent,
  • nullable parameter deprecation fix in MergeException.

2) Error handling modernization

• Removed the error suppression operator @ in three places (e.g. @chmod, @fopen), relying instead on explicit checks and error handling.

3) Test suite added (new coverage)

• Added a PHP 8.2 validation test runner: tests/php82-validation.php (commit message: 39 tests), covering:
  • minimum PHP version check (>= 8.2),
  • syntax validation of PHP class files,
  • class loading and validation methods,
  • detection/reporting of deprecated functions (sizeOf, ereg*, etc.).
• Added broader automated tests:
  • Integration tests (commit message: 37 tests) using an in-memory SQLite database.
  • Unit tests (commit message: 105 tests) focusing on validation methods and edge cases.
• Added documentation in tests/README.md.

[jlouism]

Summary of changes

1) PHP 8 / 8.2 compatibility hardening

* Replaced deprecated `sizeOf()` calls with `count()` across multiple files (commit message mentions **32 occurrences across 10 files**).

* Added explicit `public` visibility to methods that previously relied on implicit visibility (**237 methods across 22 class files**, per commit message).

* Fixed PHP 8+ incompatibility in `implode()` usage:
  changed from `implode($array, ',')` to `implode(',', $array)` in
  `scheduledBackup::validateRotateMethod()` (the old argument order breaks on PHP 8+).

* Fixed additional PHP 8.1 / 8.2 issues mentioned in commit notes:
  
  * missing spaces in `public function` declarations,
  * `dbConnection::query()` signature aligned with its `mysqli` parent,
  * nullable parameter deprecation fix in `MergeException`.

2) Error handling modernization

* Removed the error suppression operator `@` in three places (e.g. `@chmod`, `@fopen`), relying instead on explicit checks and error handling.

3) Test suite added (new coverage)

* Added a PHP 8.2 validation test runner: `tests/php82-validation.php` (commit message: **39 tests**), covering:
  
  * minimum PHP version check (>= 8.2),
  * syntax validation of PHP class files,
  * class loading and validation methods,
  * detection/reporting of deprecated functions (`sizeOf`, `ereg*`, etc.).

* Added broader automated tests:
  
  * **Integration tests** (commit message: **37 tests**) using an in-memory SQLite database.
  * **Unit tests** (commit message: **105 tests**) focusing on validation methods and edge cases.

* Added documentation in `tests/README.md`.

C'est a peu pres ca