oci_error() returns the last error found. If the optional source is not provided, the last error encountered is returned. You can use connection or statement resources as value of parameter source. If no error is found, oci_error() returns FALSE. oci_error() returns the error as an associative array. In this array, code consists the oracle error code and message the oracle error string.
As of PHP 4.3: offset and sqltext will also be included in the return array to indicate the location of the error and the original SQL text which caused it.
Huomaa: In PHP versions before 5.0.0 you must use ocierror() instead. This name still can be used, it was left as alias of oci_error() for downwards compatability. This, however, is deprecated and not recommended.