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PDO
PHP Manual

# PDO::lastInsertId

Returns the ID of the last inserted row or sequence value

### Description

public string PDO::lastInsertId ([ string `$name` = `NULL` ] )

Returns the ID of the last inserted row, or the last value from a sequence object, depending on the underlying driver. For example, PDO_PGSQL requires you to specify the name of a sequence object for the `name` parameter.

> Note:

> This method may not return a meaningful or consistent result across different PDO drivers, because the underlying database may not even support the notion of auto-increment fields or sequences.

### Parameters

`name`

  Name of the sequence object from which the ID should be returned.

### Return Values

If a sequence name was not specified for the `name` parameter, PDO::lastInsertId returns a string representing the row ID of the last row that was inserted into the database.

If a sequence name was specified for the `name` parameter, PDO::lastInsertId returns a string representing the last value retrieved from the specified sequence object.

If the PDO driver does not support this capability, PDO::lastInsertId triggers an IM001 SQLSTATE.