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$dsn
[, boolean $force
= false
] )$dsn
[, boolean $force
= false
] )$context
, int $type
[, string $persistent_id
= null
[, callback $on_new_socket
= null
]] )$dsn
)$key
)$mode
= 0
] )$mode
= 0
] )$message
[, integer $mode
= 0
] )$message
[, integer $mode
= 0
] )$key
, mixed $value
)$dsn
)