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<?php class Foo { private function customErrorHandler(int $code, string $msg): bool { var_dump(preg_replace('{^(fopen|mkdir)$.*?$: }', '', $msg)); return true; } protected function write(): void { set_error_handler([$this, 'customErrorHandler']); try { $stream = fopen('logs://foo.log', 'a'); trigger_error('Test test'); } finally { restore_error_handler(); } } public function test() { $this->write(); } } class Bar { public function customErrorHandler(int $code, string $msg): bool { var_dump(preg_replace('{^(fopen|mkdir)$.*?$: }', '', $msg)); return true; } protected function write(): void { set_error_handler([$this, 'customErrorHandler']); try { $stream = fopen('logs://foo.log', 'a'); trigger_error('Test test'); } finally { restore_error_handler(); } } public function test() { $this->write(); } } class StreamHandler { public $context; protected $handle; public function stream_open(string $path, string $mode, int $options, ?string &$opened_path): bool { $path = str_replace('logs://', '/tmp/', $path); $handle = @fopen($path, $mode); if ($handle === false) { return false; } $this->handle = $handle; return true; } } stream_wrapper_register('logs', StreamHandler::class); touch('/tmp/foo.log'); chmod('/tmp/foo.log', 0444); (new Bar)->test(); (new Foo)->test();