mysql - Parse SELECT clause of SQL queries into a PHP array

Question

This is more for analyzing a query in PHP BEFORE it's sent to the server. Very complicated why im doing this, so i'd rather not go into the reason for this.

In PHP, i need to store the field selections into a php array. So take this query for example:

SELECT user_id,username,DATE(join_datetime) as join_date, (SELECT COUNT(1) FROM foobar WHERE foonum IN (5,4,6) and user_id = users.user_id) as myfoo_count 
FROM users 
WHERE user_id = 123

So, in this case I need to store "user_id,username,DATE(join_datetime) as join_date, (SELECT COUNT(1) FROM foobar WHERE foonum IN (5,4,6) and user_id = users.user_id) as myfoo_count" into an array exploded by a comma (,). So I would get:

array (
  [1] => 'user_id',
  [2] => 'username',
  [3] => 'DATE(join_datetime) as join_date',
  [4] => '(SELECT COUNT(1) FROM foobar WHERE foonum IN (5,4,6) and user_id = users.user_id) as myfoo_count'
)

I have gotten as far as extracting the fields part of the query, but im stuck on trying to explode the fields by comma. The main problem being with subqueries which might have commas in them too (see example).

Thanks for any help!

Answer 1

For anyone coming across this question in the future someone has already gone to the trouble of writting an SQL parser in PHP.

At present it supports SELECT, INSERT, UPDATE, DELETE and REPLACE statements.