(PHP 8 >= 8.4.0)
pg_result_memory_size — Returns the amount of memory allocated for a query result
Returns the amount of memory, in bytes, allocated to the specified query result PgSql\Result instance. This value is the same amount that would be freed by pg_free_result().
resultPgSql\Result 实例，由 pg_query()、pg_query_params() 或者 pg_execute()（等）返回。
Returns the memory amount in bytes.
示例 #1 pg_result_memory_size() example
<?php
$db = pg_connect("dbname=users user=me");
$res = pg_query($db, 'SELECT 1');
$size = pg_result_memory_size($res);
var_dump($size);
?>以上示例的输出类似于：
int(3288)