[webdevsamran]

Fixes pestphp/pest#1928

Problem

On Windows, MutationGenerator::generate() parses @pest-mutate-ignore annotations by splitting file contents on PHP_EOL:

foreach (explode(PHP_EOL, $contents) as $lineNumber => $line) {

On Windows, PHP_EOL evaluates to "\r\n". When inspecting source files that use Unix LF (\n) line endings (such as repositories with eol=lf in .gitattributes), explode() does not split the file. The entire file is treated as a single line, causing any ignore comment anywhere in the file to be attributed to line 1 ($lineNumber + 1 = 1). Consequently, mutants on their actual lines are not suppressed and fail mutation testing runs.

Solution

Replace explode(PHP_EOL, $contents) with preg_split('/\R/', $contents) to handle all OS newline formats (\n, \r\n, \r) consistently across platforms.

Verification

• Added a regression test in tests/Unit/MutationGeneratorTest.php asserting that @pest-mutate-ignore correctly ignores mutators on lines beyond line 1 when files use LF line endings.