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Expose the notice callback to GC so cycles involving a nonpersistent PDO connection can be collected. Persistent callbacks remain owned by the cached connection and must not be reported by each PDO wrapper.
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Found while preparing php#25156: a notice callback capturing its nonpersistent PDO connection leaks after external references are dropped and GC runs. PDO_PGSQL now reports these callbacks to GC so the cycles can be collected.
Persistent callbacks remain owned by the cached connection and are excluded to avoid reporting the same callback through multiple PDO wrappers.