Stdlib: PDOStatement::fetchColumn()/fetchObject()/rowCount() missing — Fatal undefined method (ext/pdo/pdo_stmt.c) #19838

Category

stdlib · php-src-strict · PDO statement API

Problem

PDO + PDOStatement::fetch() / fetchAll() / bindValue() / execute() work on the VM sqlite path, but core statement methods from php-src are missing (method_exists false → Fatal on call). Zend ext/pdo exposes the full statement surface.

Observed on VM (2026-07-17) after PDO('sqlite::memory:') + query():

Minimal user-facing gap: fetchColumn() is widely used and should return the next row’s column value like Zend.

php-src reference

• php/php-src ext/pdo/pdo_stmt.c — zim_PDOStatement_fetchColumn, fetchObject, rowCount, …
• php/php-src ext/pdo/pdo_stmt.stub.php — method signatures

PHP implementation target

• ext/pdo/ (or existing PDO builtin module) — implement PDOStatement methods in PHP + JIT lowering; thin ABI only if unavoidable
• Prefer shipping fetchColumn + rowCount + closeCursor first; others can follow in child issues if needed
• No new C logic in runtime/ beyond existing PDO trampolines

Repro

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
cat > /tmp/pdo_fetch_column.php <<'"'"'PHP'"'"'
<?php
$pdo = new PDO("sqlite::memory:");
$pdo->exec("CREATE TABLE t(id INTEGER); INSERT INTO t VALUES (7);");
$st = $pdo->query("SELECT id FROM t");
echo "has_fetchColumn=", method_exists($st, "fetchColumn") ? "yes" : "no", "\n";
if (method_exists($st, "fetchColumn")) {
  echo "col=", $st->fetchColumn(0), "\n";
} else {
  try { $st->fetchColumn(0); } catch (Throwable $e) { echo get_class($e), ": ", $e->getMessage(), "\n"; }
}
PHP
php bin/vm.php /tmp/pdo_fetch_column.php
'

Done when

• PDOStatement::fetchColumn($column = 0) matches Zend (returns scalar / false when exhausted)
• At least rowCount() and closeCursor() present and php-src-strict for sqlite
• Compliance .phpt under test/compliance/cases/pdo/
• php-src-strict; no php-compiler-strict shortcut

Related

#3367 (closed PDO subset epic) · #19821 (SQLite3 API) · #10533 pillar 4