<?php class Lock { function __destruct() { echo "***lock released now***\n"; } } class LockedFile { private $lock; function __construct(string $path) { $this->lock = new Lock(); } } class LineReader { function __construct(private LockedFile $file) {} function readLines() { } } function process_lines(LineReader $reader) { throw new Exception("readLines"); } function process_file(string $path): string { try { $file = new LockedFile($path); $reader = new LineReader($file); process_lines($reader); } catch (Exception $e) { // release file echo "unsetting \$file, \$reader...\n"; unset($file, $reader); // $file is still referenced via $e->getTrace()[0]['args'][0]->file throw new Exception('Processing failed', previous: $e); } return $content; } process_file('/some/file.txt');
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