Python's with statement, but for PHP

00-transaction-context.php

<?php

class Transaction implements ContextManager
{
  public function __construct(private Database $db) {}
  
  public function contextEnter() {
    $this->db->beginTransaction();
    // Could return some other representation of the transaction if appropriate
    return $this;
  }
  
  public function contextExit(?Throwable $e) {
    if ( $e === null ) {
      $this->db->commitTransaction();
      return true;
    }
    else {
      $this->db->rollbackTransaction();
      return false;
    }
  }
}

01-usage.php

<?php

with ( new Transaction($db) as $transaction ) {
    doSomething($to, $library, $thread);
    andThenSomethingElse($author, $title, $library_name, $top_post);
}

02-internal-expansion.php

<?php

// internal values not accessible to the user
$__context = new Transaction($db);
$__exited = false;
try {
    // the transaction would be opened in contextEnter(), so you don't need complex logic in the constructor
    // this also lets "with ( $existingObject )" work
    // $transaction is optional in the with syntax and receives whatever contextEnter returns
    $transaction = $__context->contextEnter();

    // user's code happens here; no capturing is needed, because we're still in the same scope!
    doSomething($to, $library, $thread);
    andThenSomethingElse($author, $title, $library_name, $top_post);
}
catch ( Throwable $e ) {
    $__exited = true;
    // Pass exception to Context Manager, which can indicate whether to re-throw it
    if ( ! $__context->contextExit($e) ) {
       throw $e;
    }
}
finally {
    // only call the contextExit() method if it wasn't already called in the catch block
    if ( ! $__exited ) {
        $__context->contextExit();
    }
}

This is based on my reading of https://www.python.org/dev/peps/pep-0343/ and may well have some details wrong.

See that document for plenty more examples of how it can be used.