Optimize creation of empty arrays in json_decode

Use the shared empty array from ZVAL_EMPTY_ARRAY

For code that created an 10 arrays of 100000 empty arrays
(has the same result

Optimize creation of empty arrays in json_decode

Use the shared empty array from ZVAL_EMPTY_ARRAY

For code that created an 10 arrays of 100000 empty arrays
(has the same result with `$assoc=true` and `{}`)

- This is the worst-case comparison, but I'd expect 0-length arrays to be fairly
common in regular data for json_decode
- The parser implementation was using function pointers so that third party
extension developers could reuse the json parser for their own
data structures, etc. (I think).

This PR is meant to let those third party extensions continue working
without changes.

Before this patch: In 0.126 seconds: added 97.99 MiB
After this patch: In 0.096 seconds: added 41.99 MiB

```php
<?php
$json = '[' . str_repeat('[],', 100000) . "null]";
$start_memory = memory_get_usage();
$start_time = microtime(true);
$result = [];
for ($i = 0; $i < 10; $i++) {
$result[] = json_decode($json);
}
$end_memory = memory_get_usage();
$end_time = microtime(true);
// Before this patch: In 0.126 seconds: added 97.99 MiB
// After this patch: In 0.096 seconds: added 41.99 MiB
printf("In %.3f seconds: added %.2f MiB\n", $end_time - $start_time, ($end_memory - $start_memory)/1000000);

// For objects
$json = '[' . str_repeat('{},', 100000) . "null]";
$start_memory = memory_get_usage();
$start_time = microtime(true);
for ($i = 0; $i < 10; $i++) {
$result[] = json_decode($json, true);
}
$end_memory = memory_get_usage();
$end_time = microtime(true);
// Before this patch: In 0.126 seconds: added 97.99 MiB
// After this patch: In 0.096 seconds: added 41.99 MiB
printf("In %.3f seconds: added %.2f MiB (objects decoded as arrays) \n", $end_time - $start_time, ($end_memory - $start_memory)/1000000);
```

Closes GH-4861.

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Clean up JSON parser

Don't use <value> type for JSON tokens that don't have a value
and remove the errlex productions -- we're going to get an
unexpected token error anyway, there's

Clean up JSON parser

Don't use <value> type for JSON tokens that don't have a value
and remove the errlex productions -- we're going to get an
unexpected token error anyway, there's no need to handle these
explicitly.

This also removes the awkward workarounds for the unused value
warnings.

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Use %define api.pure instead of %pure-parser

%pure-parser is deprecated. In our case there is no difference between
true & full, as we don't use locations.

Upgrade deprecated directives and use non-posix bison

With Bison 3.0 some directives are deprecated:
- %name-prefix "x" should be %define api.prefix {x}
- %error-verbose should be %d

Upgrade deprecated directives and use non-posix bison

With Bison 3.0 some directives are deprecated:
- %name-prefix "x" should be %define api.prefix {x}
- %error-verbose should be %define parse.error verbose

Bison 3.3 also started emiting more warnings and since PHP souce parsers
are not POSIX compliant this patch fixes this as pointed out via
495a46aa1dc564656bf919cb49aae48a31ae15f4.

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Remove yearly range from copyright notice

Use zval_ptr_dtor_nogc() in JSON parser (it can't produce circular data structures)

Use zend_string_release_ex() instread of zend_string_release() in places, where we sure about string persistence.

year++

year++

year++

RC manipulation cleanup 2

Sync json parser defs

Update copyright headers to 2017

Update copyright headers to 2017

Update copyright headers to 2017

Use empty keys instead of _empty_ in json decoding

Fix and clean up exporting of json parser

Use embedded json parser method structure

Remove json parser depth methods and tidy it up

Add method hooking support to json parser

This commit is just a slight modification (renaming and some small
changes) of the patch that has been provided by Andrey Hristov.
It adds s

Add method hooking support to json parser

This commit is just a slight modification (renaming and some small
changes) of the patch that has been provided by Andrey Hristov.
It adds support for hooking of the json parser operations and
allows re-using of modified JSON parsing outside of json ext.

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Happy new year (Update copyright to 2016)

Use ZSTR_ API to access zend_string elements (this is just renaming without semantick changes).

Fix bug #68546 (json_decode cannot access property started with \0)

Improve json parser code

Tidy up and regenerate json parser with latest bison version