Migrate SKIPIF -> EXTENSIONS (#7138)

This is an automated migration of most SKIPIF extension_loaded checks.

Reindent phpt files

Replace dirname(__FILE__) by __DIR__ in tests

Remove local variables

This patch removes the so called local variables defined per
file basis for certain editors to properly show tab width, and
similar settings. These are mainly

Remove local variables

This patch removes the so called local variables defined per
file basis for certain editors to properly show tab width, and
similar settings. These are mainly used by Vim and Emacs editors
yet with recent changes the once working definitions don't work
anymore in Vim without custom plugins or additional configuration.
Neither are these settings synced across the PHP code base.

A simpler and better approach is EditorConfig and fixing code
using some code style fixing tools in the future instead.

This patch also removes the so called modelines for Vim. Modelines
allow Vim editor specifically to set some editor configuration such as
syntax highlighting, indentation style and tab width to be set in the
first line or the last 5 lines per file basis. Since the php test
files have syntax highlighting already set in most editors properly and
EditorConfig takes care of the indentation settings, this patch removes
these as well for the Vim 6.0 and newer versions.

With the removal of local variables for certain editors such as
Emacs and Vim, the footer is also probably not needed anymore when
creating extensions using ext_skel.php script.

Additionally, Vim modelines for setting php syntax and some editor
settings has been removed from some *.phpt files. All these are
mostly not relevant for phpt files neither work properly in the
middle of the file.

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Trim trailing whitespace in tests

gcov test fixes

Fixed bug #39527 (Failure to retrieve results when multiple unbuffered,
prepared statements are used in pdo_mysql).

- MFH change require to require_once

- Add ability to execute .php generated from .phpt on failure without the
need to manually set the environment.

MFH: Make PDO use class constants

Added:

proto bool PDOStatement::closeCursor()
Closes the cursor, leaving the statement ready for re-execution.

The purpose of the function is to free up the connection to the se

Added:

proto bool PDOStatement::closeCursor()
Closes the cursor, leaving the statement ready for re-execution.

The purpose of the function is to free up the connection to the server so that
other queries may be issued, but leaving the statement in a state that it can
be re-executed.

This is implemented either as an optional driver specific method (allowing for
maximum efficiency), or as the generic PDO fallback if no driver specific
function is installed.

The PDO generic fallback is semantically the same as writing the following code
in your PHP script:

do {
while ($stmt->fetch())
;
if (!$stmt->nextRowset())
break;
} while (true);

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1st set of fixes to make tests work with MySQL

# Additional changes pending

Stop on the 1st skip.

skip if we can't connect (include reason in skip output)

pedantic WS

rename pdo_test.php to pdo_test.inc, add it, and update tests.

last minute debug stuff sneaked in

Add tests that can be redirected to with new test harness feature.