pg_options
获得和 connection 相关的选项
&reftitle.description;
stringpg_options
PgSql\Connectionnullconnection&null;
pg_options 将返回字符串，包含指定 PostgreSQL connection 实例的特定选项。
&reftitle.parameters;
connection
&pgsql.parameter.connection-with-nullable-default;
&reftitle.returnvalues;
包含 connection 选项的 string。
&reftitle.changelog;
&Version;
&Description;
&pgsql.changelog.connection-object;
8.0.0
connection 现在可为 null。
&reftitle.examples;
<function>pg_options</function> 示例
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&reftitle.seealso;
pg_connect