Until the PHP/Laravel client connection is closed, the PostgreSQL server does not free up memory.

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This is because PostgreSQL uses a technique called connection pooling to manage connections to the database server. When a client connects to the server, the server assigns a set of resources to that connection, including memory for query execution and temporary buffers. These resources are not released until the connection is closed or terminated.

In the context of PHP/Laravel, this means that if a client connection remains open indefinitely, the associated PostgreSQL resources will also remain allocated indefinitely, even if the client is not actively executing queries. This can lead to a buildup of memory usage on the server over time, which can negatively impact system performance and stability.

To avoid this issue, it is important to ensure that client connections are properly managed and closed when they are no longer needed. In Laravel, this can be accomplished using the built-in database connection management features, such as closing connections after each request or using a connection pool with a limited number of active connections.