php function last_insert_id() is not working with REPLACE INTO query

I am using REPLACE INTO query to ins开发者_Go百科ert in to table but after executing query by using mysql_query() function and if I use last_insert_id() it is only giving me 0 value.

why this is happening so? and how can I overcome this behavior.

:Pankaj

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You could try using INSERT INTO ... ON DUPLICATE KEY UPDATE instead. It accomplishes the same thing as REPLACE INTO, but in a single server-side operation. REPLACE INTO can end up causing two operations: delete the old one, insert the new one.

But regardless of the query type, you do have to ensure that the table's primary key is an auto_increment field. last_insert_id() does not work properly otherwise.

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REPLACE INTO doesn't seem to affect the vaue that can be obtained via last_insert_id().

It seems to be the expected behavior, judging from this :

• LAST_INSERT_ID() give wrong value after REPLACE INTO query
• LAST_INSERT_ID()