Description:
------------
When creating a PDO object when using the uri invocation new PDO('uri:file:///path/to/file');  Ends up failing, because the uri passed to dsn_from_uri() includes 'uri:', which ends up being an invalid stream schema passed to php stream wrappers.



Reproduce code:
---------------
<?php
try {
  $dbh = new PDO('uri:file:///path/to/file');
} catch (Exception $e) {
  die($e);
}


Patch (works with pecl, php51 and head):
Index: ext/pdo/pdo_dbh.c
===================================================================
RCS file: /repository/php-src/ext/pdo/pdo_dbh.c,v
retrieving revision 1.82.2.11
diff -u -r1.82.2.11 pdo_dbh.c
--- ext/pdo/pdo_dbh.c	3 Oct 2005 23:27:26 -0000	1.82.2.11
+++ ext/pdo/pdo_dbh.c	12 Oct 2005 20:40:33 -0000
@@ -252,7 +252,7 @@
 
 	if (!strncmp(data_source, "uri:", sizeof("uri:")-1)) {
 		/* the specified URI holds connection details */
-		data_source = dsn_from_uri(data_source, alt_dsn, sizeof(alt_dsn) TSRMLS_CC);
+		data_source = dsn_from_uri(data_source + (sizeof("uri:")-1), alt_dsn, sizeof(alt_dsn) TSRMLS_CC);
 		if (!data_source) {
 			zend_throw_exception_ex(php_pdo_get_exception(), 0 TSRMLS_CC, "invalid data source URI");
 			ZVAL_NULL(object);