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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Explicitly allow NULL values for dblib compatibility

MSSQL won't necessarily default columns to NULL, see:
https://msdn.microsoft.com/en-us/library/ms174979.aspx#Nullability Rules Within

Explicitly allow NULL values for dblib compatibility

MSSQL won't necessarily default columns to NULL, see:
https://msdn.microsoft.com/en-us/library/ms174979.aspx#Nullability Rules Within a Table Definition

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Fix #73234: Emulated statements let value dictate parameter type

The prepared statement emulator (pdo_sql_parser.*) figures out how to quote
each query parameter. The intended type is sp

Fix #73234: Emulated statements let value dictate parameter type

The prepared statement emulator (pdo_sql_parser.*) figures out how to quote
each query parameter. The intended type is specified by the PDO::PARAM_*
consts, but this direction wasn't always followed. In practice, queries could
work as expected, but subtle errors could result. For example, a numeric string
bound as PDO::PARAM_INT would be sent to a driver's quote function. While these
functions are told which type is expected, they generally assume values are
being quoted as strings. This can result in implicit casts, which are bad for
performance.

This commit includes the following changes:
- Cast values marked as bool/int/null to the appropriate type and bypass the
driver's quote function.
- Save some memory by dropping the temporary zval used for casting.
- Avoid a memory leak if the driver's quote function produces an error.
- Appropriate test suite updates.

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Explicitly allow NULL values for dblib compatibility

MSSQL won't necessarily default columns to NULL, see:
https://msdn.microsoft.com/en-us/library/ms174979.aspx

Correct non-standard SQL. Standard SQL would define "DEFAULT NULL" -- but
that is the default value if the DEFAULT clause is omitted anyways.

- MFH change require to require_once

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

some drivers want you to say that its ok to use NULL for these columns.

Stop on the 1st skip.

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

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

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